Hi,

Though the repeat sign used by the 1st/2nd ending can't be adjusted separately from the overall font, the 1 and 2 can be adjusted. If you to go to Notation Options (hit the Opt button in the Notation Window), there's a "Text Font" setting near the bottom-left corner. Increasing the number in the "%" box will make those numbers bigger.

Hope this helps!

Thanks
Kent
PG Music