Hello,

Regrettably, there is no easy fix for that. The problem is, that this is one control which renders all the check boxes. You can try to check the following file, how the form tab is generated, however the form definition is generated from the data saved in the database:

CMSModules\Content\CMSDesk\Edit\Edit.aspx.cs

You could also try to debug the styles (e.g. with firebug) used and to try to format the check boxes with css styling.

Best regards,
Boris Pocatko