When i open a screen in order to customize it using widgets, i found that all widgets in the left toolbox is disabled. I can't drag any of them and also the scroller is disabled.

So, what can i do in order to be able to use them?

Hi Omar,

You might have the editor in preview mode. Go to View -> and disable Preview (mode).

Thank you Joao Neves, I had the same question, I searched in google and you answer gave me light!