How to recover eMail folders accidentally deleted in Apple Mac

IamTheKnowledgeSeeker wrote:

A MacBook Air (Retina, 13-inch, 2018) running 10.15.4 Catalina.

A mail folder containing subfolders was accidentally deleted. This was a Gmail account.

I opened Mail and entered Time Machine. Time Machine would not allow me to jump to another time (clicking any day/time would not jump to that day/time)); I was stuck on 'now' and so I couldn't locate and recover the missing folders this way.

So I quit Mail and manually located ~/Library/Mail in Finder and renamed it to Mail OLD. I then entered Time Machine and restored the entire ~/Library/Mail folder from a backup of earlier in the day.

On running Mail, I saw the accidentally-deleted folders re-appear ... and within a fraction of a second they disappeared again. It was as if GMail synced the wrong way; i.e. instead of uploading the recovered folders to Gmail, it knew the folders on Gmail had been deleted, so it deleted the recovered folders from Apple Mail.

How can I recover the folders from Time Machine without them being automatically deleted again as soon as Mail connects to Gmail?

You do not make it clear which Mailboxes and where?

Don't be fooled by hidden mailboxes—if you move your mouse to right side of the column to reveal the Show/Hide option.

Mail User Guide for Mac - Apple Support

See if you can recover them on the Gmail web portal. https://support.google.com/mail/answer/7401?co=GENIE.Platform%3DDesktop&hl=en