How in QT to make the components increase along with the window increase proportionally?

Question

Qt

I want to make it so that when you click on the "square" - the window spread, all components on the window would also increase in size, but also so that it is proportional

Answer 1

Use form builder.

Answer 2

As already written, you can use layouts (layout), arrange elements horizontally / vertically / grid; there is also such a thing as layoutStretch, I haven't used it myself, but according to the docs - Stretch factors are used to change how much space widgets are given in proportion to one another.; also to change/stay the size of the widget, use sizePolicy (horizontal/vertical).
At worst, you can set new widget sizes on the form by overriding resizeEvent().