Qt - Disabling QDialog's “?” button

Question

I create an instance of QDialog and on the left of \'x\' (close) button i have also \'?\' button. How I can disable that \'?\' ?

Answer 1

For Qt 5.10 and higher you can use application wide flag Qt::AA_DisableWindowContextHelpButton

 app.setAttribute(Qt::AA_DisableWindowContextHelpButton);