@mj01 Up to you to use or not to use debugger to get more information about your issue, I'm out...

@JonB Thats fine, at least I don't have to unpolish first. Although I still think there is a bug because you don't have to polish the QComboBox's ItemView when it is not inside a QTabWidget or QStackedWidget.

@dauriac Ah yes :) When you change the widget being hovered over you get a new hover event for the new widget.....

@Christian-Ehrlicher Thank you, I had a typo in the widget name in the ui file which I was able to find in the ui_mainwindow.h file.

@TUStudi Try a cascading horizontal + vertical layout for your page. Could be an issue with the stretch of the last column, where your green button lives or the QGridLayout in general. Edit: Yeah, that's probably it. Gridlayouts can have "empty" cells... Your two groupBoxes with your options take two cells above the button, which takes one, but expands to full size. As soon as you hide the content (grpBox 2nd opt) of second column, the gridLayout only has three rows (grpBx radio, grpBx first, green btn), but the QGridLayout won't delete its second column, but will leave it just empty and this takes some (little) space. Probably exact that amount of space, the green button expands to the right (aligning to the outter border of your grid). So try horizontal + vertical layouts or check, if there really is some empty cell (which should be, since you don't take the widget but just hide it). QGridLayout::columnCount() should return (at least) 2 when your app is in "small" mode (and also 2 or 3 when you switch to "big")

@SGaist said in Stacking toolbars?: Hi, AFAIK, no there's not. What kind of interface are you looking for ? Hey Woah this one slipped my fingers... I think it would look like QTabWidget with only QToolbars as its children, each toolbar being 1 other widget. But with difference that that the QTab"ToolBar" would be a toolbar so I could place it like toolbar widget... ? Perhaps I will need to somehow extend QToolbar with QTabBar and somehow make it work mhmm

@M4RZB4Ni You may want to see this example http://doc.qt.io/qt-5/qtwidgets-dialogs-configdialog-example.html

Perfect !