Your list of gaming friends is displayed in the Friends tab. Here's how to find it:
➡️ Tap the trophy icon🏆at the bottom left of the main screen to open the Ranking window
➡️ Go to the Friends tab.

To remove a player from your friends list:
➡️ Tap on the player's avatar to open their profile.
➡️ Tap Remove.

You can go to a friend's profile from anywhere else in the game where their avatar is displayed.