How to replace (update) widget in centralWidget in qt?

Question

Qt

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Answer 1

So you add the layer already to the child widget, but you need to change it again in the same central one:

QGridLayout *layout = new QGridLayout;
QWidget *widget = new QWidget();
            
layout->addWidget(treeWidgetRight, 1, 5, 1, 8);
widget->setLayout(layout);

widget->setLayout(layout);
setCentralWidget(widget);

Answer 2

Variant on float.
Assumption that sidebars are fixed width (200px in demo). The central column comes first in the markup (SEO-shniks in ecstasy).
An example from 10 years ago.

Answer 3

Try to simplify the task to a minimum, and the solution will pop up by itself ^ ^
..if it doesn’t work out, then you need to get rid of the excess)

Answer 4

I got something similar on floats https://jsfiddle.net/v1ga73uq/

Answer 5

Alternatively, the green block can be duplicated, and then we show the necessary block with a media query and hide the unnecessary one.
Here is an example of how to do this codepen.io/krontill/pen/Npjmgr