Tips and Tricks
Asset Overlay
The files in asset_overlay located at ~/.var/app/org.vinegarhq.Sober/data/sober will get used over the ones used by Roblox. Depending on the directory the files were placed in, this will allow for modifications to be made! The modifications will happen after an app restart, and is reversable simply by clearing out the directory.
The asset_overlay directory mirrors the assets directory at the same path. This means you have to recreate the folder sturcture as seen in assets into asset_overlay in order for your modifications to work! Example of replacing the mouse cursor:
~/.var/app/org.vinegarhq.Sober/data/sober/asset_overlay
└── content
    └── textures
        └── Cursors
            └── KeyboardMouse
                ├── ArrowCursor.png
                ├── ArrowFarCursor.png
                └── IBeamCursor.png
Fullscreen
The toggle for fullscreen in the Roblox app has never worked on mobile builds. However, this can be replicated by pressing the F11 key.
Note that Sober remembers the fullscreen state, and will automatically fullscreen again on a relaunch. You cannot close Sober within the Roblox app as well.