my screen is so big when on the board, that I can't scroll down, on the right side it doesn't show the bar. I have been fussing with this all day. what to do?

Did you try shutting down the computer & restarting?

try holding down the ctrl key while pressing the minus - key. holding down ctrl while pressing the - or + will adjust the screen size usually

I would go up to the "Page" icon on the tool bar, and click the "Zoom" button. I have this set at 90%. Sounds like yours might have accidently been set to a large percentage. If all else fails, I've been told to shut the computer completely down and then restart. Hope this works for you!