I define my form with new dimensions. After that I define (try to) say horizontal scrollable.

After that I try to modify the size of what can be seen when I launch my app.

I cannot grab the side of the form and modify the viewable part of the form so that the scrollbar will appear. I tried with another form and I have the same problem.

Now I'm wondering if there would be a property blocking me.

By the way I did this without in another form.