What happens to my visa if I leave Thailand before it expires and return before the expiry date?

Hi all.

Recently did my 60 day covid extension at MTT (they added the days to the end of my 30 day extension not to the date that I went to immigration if anyone is curious) so my current visa expiry date is 26 March. However something has come up and I need to head back to the U.K in the coming weeks for a few days. And would likely come back to Thailand again before the 26th of March.

Just curious how it would work regarding my visa situation. Would I be given a new 30 day visa exemption on arrival or what? Is it better that I wait till the 60 day covid extension runs out before returning? Wouldn’t want to land back in Thailand and told that I could only stay till the 26th of March or something.

Thanks