Newbie-How to disable Customized Domains and Local DNS records

Hi. I hope I am asking this correctly. Is there a way to turn off Customized Domains added to Web Blocking without deleting the Actual Domain? I also have the same question for Local DNS Records under DNS Proxy Settings. If there is a way to disable them, I can test if one or more have caused a webpage or computer function from working correctly. Otherwise, I’ll have to delete one or more at a time, test, and then add back the good ones. If the disable feature isn’t available, I would like to request It be considered for a future firmware upgrade. Thanks.