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Advice for the control panel
In my executable I would like to insert a panel for options: to build, what do you recommend to use? a QDialog or a QWindow?
What classes are you using for the rest of your GUI? If you are using widgets, I recommend a QDialog.
Usually, you won't use QWindow unless you want to create a custom OpenGL UI.
I use MainWindow class.
Yup, use a QDialog