How does the O-A Retirement Visa expiration and re-entry permit work for expats in Thailand?

When I was in the USA I received a one year O-A Retirement Visa. I originally arrived November 2018 and it was stamped permitting me one year from the date of my arrival. Just yesterday I returned again from being outside the country and again it was stamped to expire one year from yesterday.

Will Thai immigration continue to provide me one year expiration dates until when? If I time my last excursion and return, should I return just prior to the original expiration date issued on my visa which effectively means the one year O-A Retirement visa, if timed correctly is can be 2 year visa???

And what about the re-entry permit, after one year do I have apply for a new re-entry permit, or is this extended too?

When and if I need to get a new re-entry permit at the one year anniversary of the originally issued O-A Visa must I show proof of 800,000 baht in Thai bank account?

Thank you for clarification.

Robert