Do any of you know a way to disable that white rectangle at the edge of the viewport in edit mode? I do not use it, and it is a little bit distracting.
What is your document size?
It is set to max available width (WSize button).
You can change it’s color.
Thanks for the tip. I’ll try that.
I wrote a macro that will resize the canvas so there’s no border:
http://www.zbrushcentral.com/showthread.php?208308-Useful-small-ZScripts-and-Macros-for-ZBrush-4R8&p=1216227&viewfull=1#post1216227
WoW Marcus thanks very much. I’ll definitely try this. Is there a noticeable performance decrease by increasing the canvas?
You’ll notice it if you start creating very large canvases, such as 4K and above, but how much the performance decrease is will depend on your system. There’s no advantage for sculpting - it’s only necessary for exporting large dimension images of BPR renders where you need high resolution for print etc.
The macro reduces the canvas size a little, just enough to get rid of the border.
Nice to see this finally implemented.
Huge thanks to Pixo team. 
By the way, there is still a small bug (I reported it already) - the setting do not stick, you need to set it @ every startup.
broken link