OpManager Window Scaling Issue

I'm currently doing a demo of OpManager and I'm running into a minor problem / annoyance. Whenever the window is maximized, it will not scale to the width of the browser. However, if I keep the browser un-maximized, I can stretch it to the width of my screen and it will scale properly. It is only when I maximize the window that it snaps into what appears to be a fixed width.

Here are some screenshots that might explain the issue better.

Window un-maximized and stretched to width of screen:

Window maximized:

Is this a common bug that others have experienced or is this some issue with my installation?

Edit:

I just did a clean install to move from 12.0 to 12.1 and the same problem still exists in all browsers I tested (Chrome, Edge, IE11). The login page scales to the full screen size without problems for what it's worth.