@__dalin__ said in How to setup QOpenGLWindow to have access to desirable functionality?:

Run part of the project panel

In QtCreator click on Projects on the right side, then "Build & Run/Run".
"and in the system variable do we literally type "QT_OPENGL=desktop" in the field for the path" - there is no path. You simply add a new variable there (by clicking on Add button), change the Variable name to QT_OPENGL and Value to desktop, that's all.

@Lays147 Bom dia Lays ainda ha vagas?

@Lays147
Ok. was just a guess since most examples have the begin/end outside of
the loop.

sorry =/

@Fundies
The Mainwindow has the size you make it in forms designer or the size you give it in code.
It will not adjust size to the widgets it owns so you must do it. They adjust to it.