Add New Button Disabled?

[Yousef Alaa Hussain]

As you can see in this image:

the add new button is disabled for no reason, I am watching this YouTube video:
Qt Tutorials For Beginners - How to Show Another Window From MainWindow in QT
which teaches how to show another window, and if you went to the minute 1:00 you will see how this YouTuber doesn't have this issue I have, he can click on this add new… button while I can't.

Is there any way to fix it? Thanks so much
and sorry for the too many questions 😅 @JonB

[Chris Kawa]

The video is using qmake as the build system. You have a CMake based project, so it's gonna be a little different (but not too much). Instead of right clicking on the project folder right click on the project name below it (the one with a hammer icon) and the "Add New" option will be available there.