On Mac
Keyboard Shortcuts (if Supernormal does not come up here, proceed to below Activity Monitor)
Option + Command + Escape (Esc) simultaneously to open the Force Quit menu, select the app, and click "Force Quit".
Alternatively, click the Apple Menu () > Force Quit, or hold the Option key and right-click the app icon in the Dock, selecting "Force Quit"
If Supernormal is not listed proceed to below to use Activity Monitor
Using Activity Monitor
Search Activity Monitor on your computer. An easy way to do this is via Launchpad
Open Activity Monitor
Look for or Search for Supernormal
Click the X button to force quit after highlighting Supernormal:
On Windows
Keyboard Shortcuts
Alt + F4: Press this while the frozen app is active to force it to close.
Ctrl + Shift + Esc: Instantly opens the Task Manager.
Ctrl + Alt + Delete: Opens a menu where you can select "Task Manager"
Using Task Manager
Open Task Manager using one of the shortcuts above.
If the window is small, click "More details" at the bottom.
In the Processes tab, locate the frozen application.
Right-click the application and select "End task"