How can I delete my deleted GarageBand projects from my Dock?

Hi everyone,

Since recently I've been using GarageBand again. After recording and deleting some songs, I noticed that the projects are still located on my Dock.

When right-clicking the GarageBand icon, they're located above Options. Also under 'Show Recent Files' (translated from Dutch), though when I click them, they can't open (for I've already deleted them through Finder - Users - Music - Garageband > Trash Bin (translated from Dutch)).

What I've been trying to figure out is, does anybody have a clue how to delete the GarageBand projects from Dock?

PS: It's annoying seeing those silly-named projects :[