If you're using a PC, it's probably because you have altered the defult "scale" for text, apps etc.
Most apps automatically adjust to this, but some don't. Like you, I sometimes find that a frame is too big and even the resizing points are outside the screen.
To remedy this all you have to do is click anywhere in the desktop, go to display settings and temporarily change them to see the whole frame. It's easy to restore the original, but can sometimes mess with the position of the screen icons.
Failing this, you might have to adjust the screen resolution, but hopefully not.