Assigning mouse functions
You can assign specific functions, for example, rotate/zoom/pan, to the middle and right mouse buttons, either when clicked alone or in combination with the Shift, Control, or ALT keys. Functions can also be assigned to a mouse wheel where available.
Click
then Options.
Click the Mouse tab.
Select the required functions from the relevant drop-down lists to customize the mouse button or mouse wheel assignments according to your preferences.
Note: The current default is for a double click to open an item. This can be altered to a single-click in the Project items box.Click OK to save the changes and close the dialog.