I've just noticed something from another post on here.
What is a re-entry permit ?
Is there a benefit of having one
Answer summary
A re-entry permit is an essential document for foreigners with long-term visas or extensions in Thailand, allowing them to leave the country and return without voiding their current permission to stay. Without this permit, leaving Thailand can invalidate one's visa status, requiring a reapplication process upon return. It ensures that long-term visa holders maintain their legal status during temporary travel, particularly beneficial for expats planning trips abroad.
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I believe that the OP has the answers needed for his question.
A re-entry permit allows you buy a permit to maintain your long-term visa status, which you have already paid for, by purchasing a permit that allows you to travel out of Thailand temporarily and return without losing your legal status on the long-term visa which you already paid for.
It’s a “Hey, I am coming back, so don’t invalidate my visa because I have left.”
If you have a long term visa or extension and need to leave the country and expect to return before your current permission to stay stamp expires then a re-entry permit will keep your current permission stamp alive, otherwise your permission is voided the moment you stamp out of Thailand. The re-entry permit isn't practical in most cases for a tourist class entry stamp.
If you have an extension of stay and you wish to leave the country, you purchase a re-entry permit and that allows you to leave and re-enter and maintain your current extension of stay. If you did not purchase a re-entry permit and left, when you re-entered your current extension would be invalid and you would have to start the whole Visa then extension process again.