Just open up a new Cura and flick the prime tower on and off. You will see the shaded area increase / decrease around the edge of the build plate. I can think of no reason why this should be, so to resolved this, I have gone into machine settings and increased the working size of the build plate to 225mm in the "Y" direction. Seems to be working fine.
Something else I have noticed with the latest cura, 4.2.1. I can no longer have the first layer of support at 100% density, this has just stopped working.... however there are many settings in Cura I just don't understand so perhaps I am doing something wrong?
What I really need is a setting so the first layer of print on top of support material is speed variable, or a setting so one can change the speed for individual layers. Sometimes a print messes up because I don't get to manually slow it down when vulnerable details are printed.
UM3_30-07-19 CAN NOT SET L1 SUPPORT TO 100percent.3mf