https://blog.musicbrainz.org/2018/09/05/picard-2-0-4-released/#comment-182403

Before 2.0.4, you could use shortcuts like Ctrl+Y/U/L to do things like scan, group or look up files in Picard. These shortcuts have been removed (no reaction, also no indication in the menu that these exist). I’m pretty sure this changed from 2.0.3 to 2.0.4. I’m using the x64 version on Windows 7 with all the updates. – n9