How to return to the main form from the additional one in qt?

Question

Qt

After launching the second form from the main one, I want to return to the main one through the button in the second form. That is, you go in, log in, press exit, and you are thrown back into the authorization window. The usual method with including the header file does not work.

Answer 1

Read any Qt book before you try to write code, save yourself many weeks of work.
QStackedWidget
PS But in general, looking at this design, I would like to recommend QML, QtWidgets have not been developed for a bunch of years. If this is it, then the StackView