By default SA takes advantage of multi-button mouse for navigation and selection. SA provides options to control the function of the Left mouse button for computers or tablets with only 1 button.
L-Click. Selection sets the button operation to that of a standard Left mouse button click.
R-Click. Selection sets the button operation to that of a standard Right mouse button click.
R-Click (one Shot). Selection sets the button operation to that of a standard Right mouse button click for a single click and then it returns to a left click for the following clicks. This can be helpful when accessing an items right-click menu for example.
M-Click. Selection sets the button operation to that of a standard Middle mouse button click. This can be helpful for panning the graphics.