The rotation icon in my gizmo panel is greyed out and I can’t activate it. New to this, surely missing something basic …
Can you post an image of your screen?
What is the rotation icon that you’re looking for?
To rotate the object, select the blue / red / green arcs (can be seen better in 3d view)
I’m trying to activate the Rotation degree icon in the top left panel so I can duplicate walls, then rotate them exactly 90 degrees to form a room, but that icon stays greyed out.
As @Bezzo explain, drag the red blue green circle.
Click on snap and over the colors circle, not the grey, in the picture we see a color circles, isn’t?
Check this video of @Holger_Schoenischka about gizmo
Okay - I’ve got it going now 
Thanks so much Bezzo and Josepmy!
2 Likes
I realise what you’re looking for and it is the SNAP icon above the greyed out angle. Once you activate the snap icon, you can set the snap angle. 
You are welcome 
Thanks Bezzo - now snapping and rotating with precision! Appreciate your help!
1 Like