I accidentally deleted a few games, but I can't remember which ones, please help.

1. I created a Custom Tab (Metroid). It had some games from the genre that I passed.
2. I decided that I would not fill this tab because I was lazy. I decided to delete it.
3. I used Bulk List Removal, selected Custom Tab (Metroid), wrote DELETE.
4. These games (43, I think) have disappeared from my Completed Games (I used to have over 1,000, but now I have 991).

Question: what did I do wrong and how do I get these (43) games back into Completed?

UPD. I checked my list in excel and I think I found all 43 games, now I just need to add them to my profile. But I still don't understand how this could happen.

Hello!
It would be great if there was an opportunity to sort completed games by genres and studios. For example, I want to see all completed games from Capcom or all racing games.

Hi!
How to add multiple storefronts?
For example, I have Shadow Warrior 2 on steam and gog.