RIGHT click on a blank area of the desktop, choose "Properties". When the Properties window opens, click on the "Settings' tab, then move/drag the "Screen Resolution" slider to a "larger" number, something like 800 X 600 or 1024 X 768. Once there, click on "Apply", then OK and the computer will change the screen resolution to make the icons and windows smaller. It normally will give you 15 seconds to decide, so choose the "Yes" or OK option to finalize the change. Now see if the scroll indicators are more to your liking.

If that doesn't help, then you'll need to change the monitor settings. On the front/bottom of your monitor will be buttons/knobs that will adjust the location/width/height of the display. Tinkering with them will allow you to resize the display so it fits in your screen correctly.

Hope this helps.