Right Mouse click on the game cover > "Manage Tags" > check the tags you want to apply

Sorry, i expressed badly.. Tag wasn't the word, i was talking about "bookmarks". I'm sorry for my poor english (i'm from Argentina). I have created a series of bookmarks ("playing", "finished", etc), and i like to add games from "all games" to its, but i don't know how. :(

Afaik, thats not how it works, the envisaged process is:
- create the tags you want
- add them to them games you want to cover
- go to "all games" and filter for the tag combination you want to see
- bookmark the result (via the small icon on the right side of the navigation buttons in the top bar)

Inb4 they make a Favorite status and behind th scenes it's a tag with a nicer front

Now i can.. But is really complicated.. I'll wait for any update when they let me drag an drop games :P

Thanks!!

+1 vote for Favourite feature.

+1 for favorites tab

A little workaround:

Give all the games you want in your favorites tab a favorite tag like "fav". You can do that under -Game- > edit

Then press Strg + F for searching > Search for your tags name like "fav" in the example > press on your tag that is shown in the list and then press bookmark on the top left.