Hey Maha,,, This sort of thing will drive you crazy. Seems like that since this sketch is related to Thicken11 it won't allow you to do much of anything. I tried adding more lines in this sketch and could not alter them either. So what I did is to begin a new center line sketch above Sketch22 on the front plane and use that in my revolve. Your tutorials are giving me an education too. Thank you for that.
Thank you very much for your help.
My conclusion is drawing center line in sketch22 is independent but the dimension is default determined by the SW from its location.
In the video this was done without any problem. I don’t know how.
I tried with demerge the Ticken11 but no use. In the video it is merged (time 30.33).