Steam games on external hard drive grayed out

[Nonnel]

Since a couple days ago, all of my Steam games that are on my external hard drive have not been playable from Steam.

As you can probably imagine, this is sort of a problem. I've restarted Steam and my computer multiple times since it started happening. The external hard drive is plugged in. The light is on and I can see and use the Steam games in SteamApps > common on the external hard drive. Is there any reason they aren't working in the Steam app?

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[Skip]

Go to Steam's Settings, Downloads, and check the Content Libraries there, make sure wherever you've got those games is added to that list.

[Nonnel]

I don't know how it got off of there. >:0
It says that the new folder location needs to be empty. Do I have to make a new folder and add it then put all my games in there?

Nevermind, I pressed the wrong folder to add. It's all working now. Thank you!