I'm not sure if this is the placed but I created a shortcut that I use to Terminated Sandboxie when those Scammer popups cover the Desktop
For what it work I right click on the desktop, click on new > create a shortcut
In the item location I put "C:\Program Files\Sandboxie\Start.exe" /terminate_all, > Next and name it Terminate Sandboxie
The I right click on the shortcut Icon and setup the shortcut
Shortcut key: hold down CTRL and Then T, Windows will add Ctrl+Alt+T
Now I don't have to terminate Sandboxie with right click on the Icon and then Terminate all
Works Great