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I want to add a custom button to the list view of Contacts but it is not working. I go to Object Manager... Contacts... Search Layouts... List View... Edit... Custom Buttons... add my button to the list of Selected Buttons. When I go back to Contacts, it does not appear. If I remove Standard Buttons by unchecking them, nothing changes. Any direction would be appreciated.

I'm using Lightning.

public class createNewContactController_ext {

//variables for the student

private final Contact con;

private ApexPages.StandardController stdController;

String StudentRecordType = '0121H000001If0DQAS';





//variables for dependent spouse

public List<Contact> spsList {get;set;} //using list so that I don't have to declare each variable

public Integer rowNumsps{get;set;}

String DepedendentRecordType = '0121H000001If0IQAS';





//variables for dependent children

public List<Contact> depList {get;set;}

public Integer rowNum{get;set;}



//initialize 

public createNewContactController_ext(ApexPages.StandardController stdController) {

    this.con = (Contact)stdController.getRecord();

    depList = new List<Contact>();  

    spsList = new List<Contact>();

}

    //for inserting additional rows in dependent spouse table

public void insertRowsps(){

    spsList.add(new Contact(recordTypeID=DepedendentRecordType)); 

}



    //for deleting rows from dependent spouse table

public void delRowsps(){

    rowNum = Integer.valueOf(apexpages.currentpage().getparameters().get('indexsps'));

    depList.remove(rowNumsps);   

}



//for inserting additional rows in dependent children table

public void insertRow(){

    depList.add(new Contact(recordTypeID=DepedendentRecordType)); 

}





//for deleting rows from dependent children table

public void delRow(){

    rowNum = Integer.valueOf(apexpages.currentpage().getparameters().get('index'));

    depList.remove(rowNum);   

}



//save the records

public PageReference save(){



    //save the student

    insert con;



    //save the spouse

    insert spsList;

    for (Contact sps : spsList){

        hed__Relationship__c spsrel = new   hed__Relationship__c(hed__Contact__c=con.Id, hed__RelatedContact__c=sps.Id, hed__Type__c='Spouse');

      insert spsrel;

    }



    //save the child dependents

    insert depList;

    for (Contact dep : depList){

      hed__Relationship__c rel = new    hed__Relationship__c(hed__Contact__c=con.Id, hed__RelatedContact__c=dep.Id, hed__Type__c='Child');

      insert rel;

    }    



    //redirect to the detail page of the student

    PageReference redirectPage = new ApexPages.StandardController(con).view();

    redirectPage.setRedirect(true);

    redirectPage.getParameters().put('id',con.Id);

    return redirectPage;

    }



}

the vf page:

    <apex:page standardController="Contact" extensions="createNewContactController_ext" docType="html-5.0" >

<apex:pageBlock title="Student">

    <apex:form >

        <apex:pageBlockSection >       

            <apex:inputField value="{!Contact.FirstName}" />

            <apex:inputField value="{!Contact.LastName}" />

            <apex:inputField value="{!Contact.Email}" required="true" />

            <apex:inputField value="{!Contact.Birthdate}" showDatePicker="true"/>

            <apex:inputField value="{!Contact.Affiliated_Community__c}" />

            <apex:inputField value="{!Contact.Beneficiary_Number__c}" />

            <apex:inputField value="{!Contact.Birth_Place__c}" />

            <apex:inputField value="{!Contact.Social_Insurance_Number__c}" />

            <apex:inputField value="{!Contact.hed__Gender__c}" />

            <apex:inputField value="{!Contact.Counselor__c}" />

            <apex:inputField value="{!Contact.Permanent_Code__c}" />

            <apex:inputField value="{!Contact.Facebook_Profile__c}" />

            <apex:inputField value="{!Contact.Language_Preference__c}" />

        </apex:pageBlockSection>

        <apex:pageBlockSection title="Student Permanent Address">

            <apex:inputField value="{!Contact.MailingStreet}" />

            <apex:inputField value="{!Contact.MailingCity}" />

            <apex:inputField value="{!Contact.MailingState}" /> 

            <apex:inputField value="{!Contact.MailingPostalCode}" label="Province" />

            <apex:inputField value="{!Contact.MailingCity}" />

            <apex:inputField value="{!Contact.MailingState}" />        

        </apex:pageBlockSection> 

        <apex:pageBlock title="Dependent Spouse" >

            <apex:variable var="rowNumsps" value="{!0}"  />  

            <apex:pageBlockTable value="{!spsList}" var="spstable">

                <apex:facet name="footer">

                    <apex:commandLink value="Add" action="{!insertRowsps}"/>

                </apex:facet>

                <apex:column headerValue="First Name">

                    <apex:inputField value="{!spstable.FirstName}"/>

                </apex:column>

                <apex:column headerValue="Last Name">

                    <apex:inputText value="{!spstable.LastName}"/>

                </apex:column>   

                <apex:column headerValue="Birthdate">

                    <apex:inputField value="{!spstable.Birthdate}"/>

                </apex:column>   

                <apex:column headerValue="Beneficiary Number">

                    <apex:inputField value="{!spstable.Beneficiary_Number__c}"/>

                </apex:column>   

                <apex:column headerValue="Social Insurance Number">

                    <apex:inputField value="{!spstable.Social_Insurance_Number__c}"/>

                </apex:column>

                <apex:column headerValue="Delete" >

                    <apex:commandLink style="font-size:15px; font-weight:bold; text-align:center;color:red;" value="X" action="{!delRow}">

                        <apex:param value="{!rowNumsps}" name="indexsps" />

                    </apex:commandLink>

                    <apex:variable var="rowNumsps" value="{!rowNumsps+1}"/>

                </apex:column>

            </apex:pageBlockTable>

        </apex:pageBlock>

        <apex:variable var="rowNum" value="{!0}"  />

        <apex:pageBlock title="Dependent Children" >

            <apex:variable var="rowNum" value="{!0}"  />  

            <apex:pageBlockTable value="{!depList}" var="deptable">

                <apex:facet name="footer">

                    <apex:commandLink value="Add" action="{!insertRow}"/>

                </apex:facet>

                <apex:column headerValue="First Name">

                    <apex:inputField value="{!deptable.FirstName}"/>

                </apex:column>

                <apex:column headerValue="Last Name">

                    <apex:inputText value="{!deptable.LastName}"/>

                </apex:column>   

                <apex:column headerValue="Birthdate">

                    <apex:inputField value="{!deptable.Birthdate}"/>

                </apex:column>   

                <apex:column headerValue="Beneficiary Number">

                    <apex:inputField value="{!deptable.Beneficiary_Number__c}"/>

                </apex:column>   

                <apex:column headerValue="Social Insurance Number">

                    <apex:inputField value="{!deptable.Social_Insurance_Number__c}"/>

                </apex:column>         

                <apex:column headerValue="Delete" >

                    <apex:commandLink style="font-size:15px; font-weight:bold; text-align:center;color:red;" value="X" action="{!delRow}">

                        <apex:param value="{!rowNum}" name="index" />

                    </apex:commandLink>

                    <apex:variable var="rowNum" value="{!rowNum+1}"/>

                </apex:column>          

            </apex:pageBlockTable>

        </apex:pageBlock>

        <apex:commandButton value="save" action="{!save}" />  

    </apex:form>    

</apex:pageBlock>

</apex:page>

You have to use recordSetVar to add a button to List view. Adding recordSetVar makes it a StandardSetController and thus makes it available in that picklist to select.

<apex:page standardController="Contact" extensions="createNewContactController_ext" docType="html-5.0" recordSetVar="contacts">

Also, The list view VF page button won't be visible in "Recently Viewed" List view, you have to select any other listview to see that button.

EDIT:

Your apex Extension should be StandardSetController extension as well. StandardSetControllerExtension works on Set of records.

public class createNewContactController_ext {



    public createNewContactController_ext(ApexPages.StandardSetController controller){

    // constructor logic

    }

}

NOTE: StandardSetController allows you to use the page in a List Button, whereas using a StandardController allows you to use it in a Detail Button.

Once you save your VF Page and Apex Class, It will be visible for you to add to Listview.

Src : https://salesforce.stackexchange.com/a/144831

In order to use your page as list button, you need to use standard list controller instead of standard controller like this:

   <apex:page standardController="Contact" recordSetVar="conList" extensions="createNewContactController_ext">

Refer to below link for more details:
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_controller_sosc_custom_button.htm