Hi ₭ᶏᶏᶖꝗ♣™

When you’re on a PC or Mac,
click on the cogwheel icon in the middle of the window. A menu opens where you can choose the number of frames. 

When you are on a mobile device, tap the cogwheel icon in the bottom left corner, then select “Game settings” 
Next to “number of frames in a match”, tap on “Any”.
A menu appears that allows you to select the frames.

Wishing you a nice day and lots of fun playing the games!

John