GMod Content Mounting Crash

I (rather stupidly) ticked the options to mount content from games that were said to be available, but I had not installed, thinking that the content would be available anyway, and so, Garrysmod freezes on startup because I don’t have the content installed.

I know that I could fix this by installing the games, but I want to save space on my Hard Disk, so is there any way of changing the options for the content it is mounting without needing to start the game?

Any help will be much appreciated!

Open Steam\SteamApps\YourName\garrysmod\garrysmod\config or cfg and delete content.txt

Great! It worked! Thank you for the solution, it’ll come in handy in the future too.