The list is in the same order as displayed - though the display of the icons is context sensitive which doesn’t help. I think most are obvious except Personal Mix Mixes, Radio, Shuffle, Shuffled, ... What the random
Go back to the home screen and click on the cog icon, then: Interface > Now playing screen > Extended player (Portrait) > Style (bottom of screen): Icon 1-7
Just like the album page settings it only lists the function, so you might need to investigate further.
They look like: Repeat, Shuffle, Smart Flow, Current queue, Favourite, Lyrics and More actions.
Settings > Interface > Home page > Shortcuts.
Select those you’d like to see and reorder as required (drag on the horizontal lines).
Alternatively you can access your library from the bottom navigation bar.