Hello!
Could anyone please tell me how to sort games in My Account in alphabetical order, if that's possible, of course. If not, I hope that the site webmasters will soon add that feature, because sorting a large number of games manually is not an easy task.

You can't do that automatically, unfortunately. You can, however, click and drag the boxes and order them how you like.

That's true, you can't sort your game collection automatically.
However, you could post your suggestion in [url=http://www.gog.com/en/forum/general/gog_039_s_features_wish_list/_/1/search/features wishlist/]this thread[/url].

Well, no dice, I guess. Thanks, everyone. I've just posted a suggestion in the wishlist thread.
P.S. It seems that just I accidentally pressed the Solve button here. :) Well, in a sense, my question is indeed solved. The problem itself is not, but only the webmasters can do anything about it. Again, thank you for replying.