Studio's Game Window not Resizing Properly

Hello,
I have been extremely confused by this bug. Could anyone help me out?
Here’s the explorer and properties at a “normal” size:


And here’s the explorer resized. Notice how the game window hasn’t resized alongside it. Is this a beta feature?

Any help is really appreciated.
(its set on Fit to Window and I don’t know what’s wrong. Even setting it on devices with lower resolutions doesn’t work.)