Hey,
When selecting your element, check your Size panel : if you have that Scroll overflow checked, check the second one instead, the “Hidden” one, otherwise you’ll always have a scrollbar on overflowing content.
Just to add something else onto this, if you do have extra content that you want a vertical (but not horizontal) scrollbar to appear for, just click “Auto” - but if you don’t want any scrollbar at all, do what Nathan said :)