I apologize in advance, I may be writing to the wrong section of the forum. By solving my question, the topic can be deleted.
The fact is that I can't figure out how to accept the character's choice when creating it. There are no "OK" buttons, I tried all the key combinations. Also, how do I change the game resolution? Make it full screen?

Option 1: Change your windows resolution to something bigger, you're running too small. Then, once you create a character and are in game, you can use alt + f2 to change the window size to something small, and fix your resolution.

Option 2: On the launcher, click "RESET" and select Full Screen.