I have just installed Engine OS v1.5.1 on my Prime 4 and immediately have found an issue.
Whilst using the font enlarge icon on the track list it jumps to another part of the track list. When I revert back to the smaller font the track list is where I want it to be.
Video attached. https://youtu.be/9cmVdF4Trg0
Also no track preview unlike the Prime 2