Configure the option "Workspace color" (toggle between standard and user-defined; Tools > Options)

Here you can configure if PlanMaker paints the area outside the page in a user-defined color (value ON) or not (value OFF).

WSColorEnabled

0. Off
   

   Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
   Registry Path	SOFTWARE\Policies\SoftMaker\PlanMaker 2016
   Value Name	WSColorEnabled
   Value Type	REG_DWORD
   Value	0

1. On
   

   Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
   Registry Path	SOFTWARE\Policies\SoftMaker\PlanMaker 2016
   Value Name	WSColorEnabled
   Value Type	REG_DWORD
   Value	1