Thumb dragging Dragging the thumb is historically the traditional way of manipulating a scrollbar. By moving the cursor over to the thumb on the screen and then pressing and holding, the thumb can be dragged. This is often done using either a trackpad or the left click button on a conventional mouse or touchpad. Moving the cursor while pressing down moves the scrollbar's thumb to see different sections of the page. On applications native to OS X 10.11 (and some previous OS X versions), scrollbars do not show up on the user interface until the user uses another scrolling technique, such as the two-finger scroll or using the arrow keys. Therefore, the user must scroll using one of these methods first, and then move their cursor over to the thumb, wherever it appears.
Thumb dragging Dragging the thumb is historically the traditional way of manipulating a scrollbar. By moving the cursor over to the thumb on the screen and then pressing and holding, the thumb can be dragged. This is often done using either a trackpad or the left click button on a conventional mouse or touchpad. Moving the cursor while pressing down moves the scrollbar's thumb to see different sections of the page. On applications native to OS X 10.11 (a.nd some previous OS X versions), scrollbars do not show up on the user interface until the user uses another scrolling technique, such as the two-finger scroll or using the arrow keys Therefore, the user must scroll using one of these methods first, and then move their cursor over to the thumb, wherever it appears.