How to remove blue border in windows 10?

[Anton Shelenkov]

I creat mainWindow widget and it have 1px border around widget in windows 10. How i can delete it?

I found solution!

in .pro
QT += winextras

in .cpp

#include <QtWin>
QtWin::extendFrameIntoClientArea(this,-1,-1,-1,-1);

[mrjj]

Hi
That is the OS frame/decoration. (not drawn by Qt but the OS)
You can disable it with

Qt::WindowFlags flags = this->windowFlags(); 
this->setWindowFlags(flags|Qt::FramelessWindowHint);

However, you loose move and resize functionality.