On a "Page" page (home page), I first removed the left side bar by entering page ID in "LEFT sidebar: Don't display on Pages: " of Atahualpa Theme Options/Side Bar section.
I now changed my mind and deleted the page ID to get it back, but can't get the left side bar back.
Also, I created the second "Page" page and expected to enter the page ID to remove the left side bar as well, but it showed up automatically without the left side bar. I now want the left side bar also on this page (and all future pages). What to do? Shall I delete everything and start from a scratch? Or would that confuse things?