You can also use the computer client to perform these steps.
You’ll see a list of everything you are subscribed to in the Steam Workshop.
The mod has been removed from your Steam Workshop, so Steam will not download the mod again after you delete it. However, it has not yet been removed from your game.
If you are using the Steam computer client, click Library > Games then right-click the game from the list in the menu on the left side of the screen and click Properties. That game’s “Properties” window will open.
If you are using the Steam computer client, you can click the Local Files tab from the “Properties” window that you navigated to in the previous window and then click on Browse Local Files. Your file manager will open in the main game file, but you’ll still need to locate the mods or addons folder.
If you are using the Steam computer client, you can click the Local Files tab from the “Properties” window that you navigated to in the previous window and then click on Browse Local Files. Your file manager will open in the main game file, but you’ll still need to locate the mods or addons folder.
If you have more than one mod per game, you want to delete the one with the name that’s similar to the mod name. If you can’t tell which is which, you can delete all of them since the ones you are still subscribed to will be automatically re-downloaded once you restart the game. [1] X Research source
