Please describe the problem you think should be solved

Github desktop uses Windows 10 style window controls on Linux, which looks very out of place. In addition, this also prevents shadows from showing when using KDE.

This is what it normally looks like:

[Possible Solution] Allow people to enable native titlebars
Just using native titlebars (and menu bars too) should be relatively easy to implement I believe, as that's the default.

I force-enabled them just to add some screenshots to demonstrate how much more consistent it would look. Also notice how the window now has shadows properly showing. I cannot disable the built in windows 10-style window controls Github-desktop shows though, hence this issue.

Just as a side note, KDE can set per-window color schemes, so this is what it would look like with a custom color scheme for Github-desktop:

EDIT: Offtopic, but I just realized this is not the official repository. Does that mean microsoft does not actually support Running github desktop Linux?