Describe the solution you'd like
Files UWP menu with a corner will be great. It will look good.
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@seohyun1108 Can you please update your proposal with more details on what you would like to see?

Like that! (Sorry, I'm not good at drawing)
Menu with a corner.
And, I think it will be beautiful if the settings button become like it. (No "Settings" letter, only an icon)
something like this?

The requested design looks nice, but I believe that rounded corners would break out with based Windows style.
Yes! I like it!
A rounded corner design wouldn't look too good in this case unless the actual window was rounded as well.
@yaichenbaum It's not possible to round a UWP window.
@yaichenbaum It's not possible to round a UWP window.
Correct.
I think Microsoft is developing UWP round windows, so maybe later this can be happen.
Most helpful comment
The requested design looks nice, but I believe that rounded corners would break out with based Windows style.