Windows 10: Shortcut key combination for 'Full Screen' button in Store Apps?

In Apps downloaded from the Windows Store (such as Words With Friends or a million other apps - not regular 'Windows Applications' such as Photoshop or something), they run in a special 'shell' that is obviously controlled by the OS. There are now 4 buttons in the top right (Close | Max/Restore | Minimize | Full Screen - from right to left). All the normal windows shortcuts work for all the known buttons but none of the possible/expected key combinations work for the 'Full Screen' button (such as ALT+ENTER or WINDOWS+UP several times). The button looks like two arrows pointing outward at a 45° angle. If you ARE in full screen, they look the same but the arrows point inward.

I don't know if I can post a link but here's the button I'm talking about https://i.imgur.com/YQc083l.png (just an Imgur link to YQc083l.png).

:)

 

Shortcut key combination for 'Full Screen' button in Store Apps?

Thank you for your reply however my question would really pertain to any Store App - Words With Friends was just an example so it was known that I was talking about Store Apps and not applications such as Photoshop or something. Update: I guess
these are called Universal Windows Apps.

In the Store Apps I've tested, three of the 4 buttons in my
previously posted image can be controlled via shortcut keys (Alt+F4 to close & combinations of WINDOWS+UP/DOWN/LEFT/RIGHT to control Maximize/Restore/Minimize and even quadrant
resizing) regardless of which Store Application I'm in. So I guess the question remains as to what is the keyboard shortcut for Full Screen - or if one exists.

It would be nice if you could just keep hitting WINDOWS+UP to get from non-Maximized to Maximized and then to Full Screen and WINDOWS+DOWN to reverse the same.

 

Shortcut key combination for 'Full Screen' button in Store Apps?

Hi,

Thank you for posting your query on Microsoft Community.

As per your description, I understand that you are unable to use keyboard shortcuts on“Words With Friends”. We will assist you.

I would like to inform you that we have downloaded the game and found that it is not possible to use the shortcut keys. I suggest you to contact the game manufacturer to receive better assistance.

Hope the information helps. Let us know if you need further assistance. We will be happy to help.

Thank you.

 

Unfortunately it's impossible to Google a search phrase that includes 'Windows' 'Shortcut key' 'Full Screen' or the like without returning a flood of pages that are just the normal shortcut keys that I already know. If I knew what to call that 'shell' that Apps from the Store run in, I might be able to narrow it down but they appear to be exe files and don't fire up a separate process when they launch. Any info on what that process is called that runs Windows Apps from the Windows Store may assist in my Google-foo. Of course, MS may not have any shortcut key for that 'Full Screen' function - there doesn't appear to be any 'tooltip text' when you mouse over the button in the image I posted originally.