Trish said:
when I select 11 x 17 size paper, publisher goes from one page to tiles
That's what happens when you select 11 x 17 _pages_, without changing
the paper size. Page size and paper size are chosen separately in
Publisher; you can put a small publication on larger paper, or span a
smaller publication across many sheets.
Your page size is selected in File > Page Setup. Where to set the paper
size changes from version to version; either File > Print Setup or File