I am working for a client using a test org (The client also has a Stage and a Production Org). I need to add the Add To Campaign button to the Recently Viewed List in Test org and Stage org. I noticed that the Production org has this button displayed for its Recently Viewed List of leads. However on both the Test and Stage orgs list of leads, when I used the following series of commands I saw that the Lead Search Layout's List View layout did not exist. Here is the command sequence I used:
Set up> Lead> Search Layout> look for "List view"> Edit it and Check the *Add To Campaign* option.
Q) What happened to the List View for the Test and Stage orgs for the Lead Search Layout?
Q) Is the List View layout only for Salesforce Classic? I had always thought that there was a lightning version also.