What should I select for the Covid extension in Thailand and how do I check in with my appointment?

A user from the UK inquires about which option to select for the Covid extension on their Thai visa application, asking whether to tick 'Unable to return' or 'Embassy can't provide letter for temporary stay'. Additionally, they seek clarification on the process for their online appointment, specifically whether to go straight to Counter J or show their appointment confirmation at the ticket point. Responses suggest that the choice of option is inconsequential, and it's advised to show the appointment email at the queue counter. However, some warn about the unpredictability of Counter J's handling of appointments.