you show the printed E-Visa.pdf document upon entry into Thailand. You will get stamped in for a 90-days "Stay Permit". And the visa itself will become invalid (it is only good to use for ONE entry). You can apply for a "1-year Extension of this Stay Permit" based on the reason this Non-O visa got issued for, on Immigration, if you fulfill the requirements
the question about the visa was already answered by 3 others. However they forgot to mention the TDAC. That's why I added this very crucial information. Incomplete replies need a completion 😉
I agree, too. Yet, it remains to be seen . . . . . . The DTV is NOT mentioned in the police order describing the "change of visa type" to a 90-days Non-Imm-O retirement visa, unless you define "tourist visa" regarding EVERY tourist visa class. Until now. I yet haven't read or heard about a DTV being used for the change (number 9 in the list). The police order requires you to start with a visa-exempt, with a tourist visa or a transit visa. The DTV is not mentioned. It remains to be seen if Immigrations will interpret it accordingly and accept such a change