Sheet setup for a Mac

I am a new user evaluating Draftsight. I am a bit disappointed with the lack of community involvement in responding to questions but I will give one more try at a new question.

I am trying to set up the sheet tabs for 11x17 printing.

My printer is only for letter sized paper but I have never had problems setting up any size I want to save as PDFs in Autocad.

All the tutorials I find seem to show only PC or window versions so my set up looks different.

My attempts to set up the sheet sizes have resulted in failure with sizes less than an inch in height and width. What am I doing wrong?