You could click on the maximise button for the sheet window or use
Window | Arrange to see if this has any effect.

Hope this helps.

Pete

Kathy975 wrote:
I opened a read-only copy of an Excel spreadsheet. It opened at a quarter
size of the screen. The only help available says to enlarge by using the
sizing handles. When I go to the sides or corner, the sizing handles DO NOT
show up. Please help. TIA.