Actually running 2.9.83 (not selectable above) In the music library (Local Music) there's a mouseover popup giving the full track name. That doesn't happen on the playlist and with long track names you're uncertain which track is in the queue if there are similar names in that album. To find out I'm forced to use 'Edit track details' - typically I want to add the tracks with similar names to the playlist to go with the track that's been added by the dynamic playlist I'm using by then going to 'Show in Media Sources'. I think it would be useful if there were a popup here too. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.110.0 KDE Frameworks Version: Qt Version: 5.15.10
Playlist tooltip can actually be enabled from Edit playlist layouts -> Show tooltips. However, the tooltips that way are pretty extensive, the setting is not that easy to find and there's also an earlier request for showing the ellipsed name from long time ago https://bugs.kde.org/show_bug.cgi?id=214422 so this is probably something that could be improved somehow.
Not sure I've ever used that dialog before, though maybe there's a bug report with my name on it somewhere reporting a problem with it! (Ah https://bugs.kde.org/show_bug.cgi?id=312255 ;) ) Even with your pointer I hunted around 'Configure Amarok' before finding it elsewhere in the Playlist menu. Yes could IMHO be simpler.