ZBrushCentral

Question: How to increase Alpha Size by"Grab Document" (GrabDoc)?

Hello,
I am struggling since long time with a problem:

When I want to create an Alpha from my Mesh, I can create only a small alpha (1120 x 840px).
I have increased document size, but the grabbed Alpha stays always small - even worse than that, it is displayed then smaller in the preview icon.

QUESTION: are there other hidden settings, how to increase the “grab doc” alpha size?
I used Document Size (also resize button), texture size and I also initialized ZBRush…

Many thanks
p.s. using latest ZBrush 4R7 P3

Attachments

Small Alpha problem ZBrush.jpg


The same applies when you want to render large documents.