I had to reset my PC forced and had my games on my HDD, which was not formatted. Restore?

These are games of the following platforms:

1) Epic Games

2) Kart Ridge

3) GOG Galaxy

4) Twitch (Twitch Prime)

Install, copy existing folders.

So completely your question is not very clear to me.

All games are still installed but not listed. For Origin, for example, you can search for game click, is that synonymous with the platforms synonymous / something similar?

Where listed? How can that be when you have reinstalled?

Just formatted my SSD, my games are on my HDD, which I took as it was

So they are listed in the respective launcher as "not installed", but in Steam and so you can then yes the game folder is still available scan, knew what I mean? Steam then recognizes that the games are there, and you do not need to reinstall them.

As I said… Install games and then the folders on the newly added drüberkopieren. Before you have to save the stop.

So there are no such functions in the 4 game launchers to simply scan this?

Must be reinstalled.

Savings can be saved if the directory is known.