To remove a user from the List Stacking Dialer;
Go to your ‘Profile’ and select ‘Manage Users.’
Click the name of the person you want to remove the access from the dialer.
Select "List Stacking Dialer" and disable the access from there.
See the attached sample screenshot below.
Removing a team member from the Advanced Leads Dialer;
Go to the user's module permission.
Disable the access by turning the toggle off.