Ability to make the alerts fullscreen? It would make it look more convincing. Either I'm just blind or that's not a feature.
So you want to press F5 on this screen:
Then it should go into fullscreen. Make sure you’re using the latest version which is 6.1.0
Note: F5 is the “function 5” button, not F+5
Here is a picture to show you the buttons, press the one that says “F5” their usually the same on most keyboards, sometimes their separated.