How to make toggleable Fullscreen

What console command allows users to set full screen? When I packaged my game and send it out people said that F11 would not make it full screen. Is there a way I can set it up so when the player presses a button in-game, the game switches to full screen? (Blueprints is what I am using)

You can use the console command r.SetRes 1920x1080f for switching to full hd fullscreen, you can use any values you want there. Apart from this, Alt+Enter should always make your game toggle fullscreen in a standalone game. F11 is only for the editor.