In the Chrome extension, you can use the keyboard shortcuts to control the screen recording. The provided keyboard shortcuts are:
Start or Stop recording
Mac option + shift + E
Windows alt + shift + E
Pause or Resume recording
Mac option + shift + K
Windows alt + shift + K
Restart recording
Mac option + shift + F
Windows alt + shift + F
Discard recording
Mac option + shift + D
Windows alt + shift + D