Using Nautilus 3.4.*, I decided it was time to rename/remove the distracting unused bookmarks in Nautilus (file explorer GUI).

Found this thread which has the solution.

In Nautilus click view > Show Hidden Files then from your home directory go to /.config/ in there you will find a file called user-dirs.dirs this contains the entries under ‘Computer’.

MAKE SURE TO BACK UP ANYTHING YOU CHANGE

If you change, for example, XDG_DOWNLOAD_DIR=”$HOME/Downloads to just XDG_DOWNLOAD_DIR=”$HOME/” the downloads folder will no longer show up under ‘Computer’ in the sidebar.

You can also just comment out every line, in which case it will only show ‘Home’, ‘File System’ and ‘Trash’. It will keep those other directories as bookmarks though so you can do what you like with them.

This will not remove the ‘Computer’ entry entirely, just remove its entries, but it will make it look considerably cleaner. Sorry I can’t help on the ‘Network’ Entry.

Sources: Personal experience trying to restore missing entries under ‘Computer’.