Cannot add directory to library in settings

[Adrien-Luxey]

When I type s, the settings view shows two boxes: one entitled "browse (SPACE to add)" on the left, and another "music paths (BACKSPACE to remove)" on the right.

When I press SPACE to add a selected folder to my library while the left-hand box is highlighted, the music starts or pauses, but no folder is added to the right-hand side. I tried emptying the play queue, so no music starts/stops, but nothing happens still.

Other remarks:

• There is no indication of the current directory on the left-hand side.
• The feature is not documented in the user guide.
• Browsing on the left pane is cumbersome. It would be best to also be able to enter the desired path at once (e.g. copy-paste). This is minor: one doesn't add folders to the library very often.

Musikcube v3.0.2 #a46813db3 on Linux Mint 21, 5.15.0-88-generic, using Guake and tmux (although the other key-bindings work fine).