Select all sheets by right clicking a sheet tab and click "Select All
Sheets", now goto Page set up and do what you want.
Click a non active sheet tab to de-select all sheets.

Hopes this helps.
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Per

"LJL" skrev i meddelelsen
...
I have an existing Excel workbook with some 20 worksheets in it. I would
like
to change the page orientation and margins for the entire workbook without
having to do it for each worksheet individually. Is there a way to do
this?