When I click "Open Configuration File" in settings of bitcoin core I get these:

https://i.imgur.com/iJTz0N8.png
https://i.imgur.com/9dZXp5d.png

If I go to %AppData% -> Bitcoin -> bitcoin.conf
I get an empty file:
https://i.imgur.com/mgYt5iF.png

I remember I had made the bitcoin core installation some months ago, and I successfully changed things inside the bitcoin.conf, like for changing to testnet/regnet.

Any help? What do I do now?