What documents are required for a non-O retirement extension regarding bank statements?

Makes sense.

Many immigration offices are requesting a one year detail transaction print out when you use banked money method

That's because so few people actually update their bank book regularly and at most banks if you don't update your book within 21 days all it prints on your bank book when you do is money in total, money out total for the time since you updated it last 😮

That doesn't show the balance on the account every day and that's what immigrations needs to see because for banked money method. You need to show that you need to have the 800K baht in the account for 2 months before you apply, you need to keep the 800K baht in the account for 3 months after the extension is granted and then the balance can't go below 400K baht for the rest of the year until you get it back to 800K baht 2 months before your next extension

The first year extension you get (from the Non-O visa) you can just get away with the bank book updating and the bank letter (although many banks now just print you the 3 month statement along with those)

BUT

For every subsequent yearly extension using banked money you should ask your bank to print you a year detail transaction report and give that to the officer along with your 'standard bank letter' and the copies of the bank book which was updated to show the balance on the date you apply