How to stop game running?

I’m new to using citra and i want to change system settings under “properties”. however citra says that i cannot change system settings while the game is running, how can I stop the game running so i can change my settings?

I’m using a mac and nightly version btw.

In order for us to provide better support, we need to see the log generated by citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File