UI Stretch with QtCreator

[Paullux]

I create an ui for my app with QtCreator but i cant make it stretch, when i reduce the window the QpushButton are hiding :

my main ui is like this :
mainwindow.ui

the tree of my ui is :

how to make it stretch ??? i like the actual presentation but i can change it and for small screen the window is to large.

[Bonnie]

Because the three layout widgets are not added to any layout. They are child widgets of centralWidget, but they are not added to its layout.
A widget will only be resized and moved to fit the window when it is added to a layout whose parent widget is either the window or also added to an layout whose.....(repeatedly)

[Paullux]

@Bonnie said in UI Stretch with QtCreator:

Because the three layout widgets are not added to any layout. They are child widgets of centralWidget, but they are not added to its layout.
A widget will only be resized and moved to fit the window when it is added to a layout whose parent widget is either the window or also added to an layout whose.....

Thanks for help me, that works