Between 1981 and 1982, the Xerox Star moved the scrollbar to the right to get it out of the way and reduce visual clutter. Scroll arrows pointed inwards in the direction the content would move based on user studies, and + and – buttons allowed for scrolling by pages. The thumb was a fixed size diamond, independent of how much of document is visible. Clicking in the thumb elevator region would jump to that part of document.
Between 1981 and 1982 the Xerox Star moved the scrollbar to the right to get it out of the way and reduce visual clutter. Scroll arrows pointed inwards in the direction the content would move based on user studies, and + and – buttons allowed for scrolling by pages. The thumb was a fixed size diamond, independent of how much of document is visible. Clicking in the thumb elevator region would jump to that part of document.