1st way :Click the "all bottom" located between the letter A and number 1 to
select the complete worksheet, then select arial - 10.
2nd way : to have it set to arial-10 > click tools>options>general
in standart fonts select> arial - 10

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> All my worksheets are in Arial 10, but from time to time when I make new
> entries they appear in Arial 8. Will someone please explain why it happens
> and how to eliminate this nuisance.