If you are encountering Steam Destination folder must be empty message in Windows 11/10, use these solutions to fix the problem.

The remedies listed below should be able to help you get rid of the issue “Failed to add new Steam library folder” when installing a game or creating a new library folder.

If Steam games are not showing up in your library, you can follow this guide to fix the issue and get the games back in your library.

Now select "Downloads" and then click the confusingly titled "Steam Library Folders" to open the storage manager up.

Switch to the Steam Library, and on the left, look for the game whose folder you have transferred to your external disk. Right-click on it and select Manage ->Uninstall.