I comiserate with u completely - I didnt spot them either until I spied an example screenshot which had Videos shortcut on so I rumaged around a bit further.
Because the “system shortcuts” (Videos, Music, Downloads etc) are burried with everything else under All Apps, u miss them. They need a “Systems” category but I guess no rooom down the side bar!
There are some Help videos… but only accesible off the Help shortcut so a bit “chicken and egg” here!
Maybe the first time u choose new Grid view, it should auto populate with all the system shortcuts for u to remove the ones u dont want. Or it could ask u if u want to do this, first time only. Or maybe off a menu option anytime: “Add All Missing System Shortcuts”. But this is the least of their problems with masses of MP4s not playing/becoming music files!
As an aside: have u noticed that Favourites has been remapped to"Add shortcut to Home" but still uses same red heart icon on menu and on file tiles. But when u want to remove shortcut, which u can now on a menu, u see a different icon. A wastebin I think. mmm inconsistant, says me the UI pedant in me.
Also, as so many mp4 vids don’t play, I wanted to mark them for future watching when new firmware arrives but cannot move them to a folder. So decided to use the old “Queue” function which u used to view off the Dashboard under Mochi. No dashboard queue shortcut under Grid of course. But found out a) u can select only queued sources within Video and b) also u can still choose Dashboard for a remote control button. It doesnt work off Home screen, but it still popps up when in Videos display! A feature or a bug? I cannot decide. But it made me laugh.