It depends, but there may not be an easy way out. See https://support.mozilla.org/en-US/kb/thunderbird-beta#w_how-do-i-change-from-a-beta-version-back-to-a-release-version

Thanks for the link. I was also wondering and maybe you might have a thought about it, if I go to a laptop I use when I'm out of town (it currently has beta version 103.0b4 (64-bit) on it. That version of beta was much more stable and usable. Could I use profile being used by it (copy and paste it to my desktop)? Would that take me back to that version or maybe even be usable with the current non-beta version online? Any thoughts or suggestions would be appreciated. Thanks

The simplest choice is to revert to a beta version prior to 111.0b1.

Such information was posted in https://thunderbird.topicbox.com/groups/beta/T42a262a7517a11c6-Md351bb465a131ad41fb4d1b2 You could use also use http://ftp.mozilla.org/pub/thunderbird/releases/110.0b4/ Because there are no migration considerations between 111 and older 110 or 109, you can use the following switch on your command line when starting Thunderbird with your *current* thunderbird profile

   --allow-downgrade

p.s. I would advise you to update your 103 beta to something newer.

If you want to stop using beta completely, that is also possible. There should be no migration issues when going from the *current* beta 111 to version 102. Use the following switches on your first startup of version 102 to pick the beta profile

  -P --allow-downgrade