How to remove the default frame?

Question

Qt

Hello!
Please tell me how to remove the frame (save icon, arrows, scaling, etc.), when creating a window through the cvShowImage function or
imshow

Answer 1

setWindowFlags(Qt::FramelessWindowHint);

Answer 2

Sorry, I didn’t mean standard Windows functions (minimize, close, etc.)
But what it created with the arrow window, save sign, scaling