Up until a recent release, not sure which, if you had movies sorted by title, and you were at the top/home part of the list, and then pressed "S" for example, you immediately went to the beginning of the "S" list.
This has now disappeared.
When you press any key with the movie sort on title, the focus just disappears completely and nothing in the window changes
After a filter has been created and a list of movies generated, make sure you click one of the movies first. Then you may search by letters by pressing the corresponding one (in title order).