Make the window border more distinctive from the application behind it
The Teams window fades in colour to the bottom right which is where the corner resize handle is.
The colour at this corner of the app is often the same colour as apps in the background which makes it hard to find/grab the resize handle.
Mark E commented
This is important because the problem can be compounded by user vision and monitor contrast settings. We're not talking about all new color schemes, just tweaking the ones you have for better visual distinction.
Aleksey Shurtygin commented
Anyone knows if there are any updates on this? This is really annoying.
I wish I could comment with screenshots about how absolutely disorienting Metro/Fluent design language is. It's going to be a long decade until something new becomes the new hot thing in the valley....
The general design of Microsoft apps and the use of windows in Windows 10 make windows look more like graphical glitches with no depth or hierarchy to what windows are actually on your screen.