Hey there @minnoş
Thank you for your post.
We hope you don't mind us replying in English since English is the official language here in the Community.
To show/hide Friend Activity - please follow the steps bellow:
Note: Your Spotify desktop window needs to be at least 1190 pixels wide for the friend feed to show.
Hope this was helpful.
Get back to us if you have any questions. We're happy to help 🙂