Please hover over the keyboard buttons to see the info text:

Mouse Buttons (Gestures)
Left Mouse Button Mouse Wheel Right Mouse Button
-- BOARD -- -- LAYERS -- -- CAMERA --
drag: rotate click: cycle modes drag: rotate
using Ctrl key: roll no wheel? - use: click: popup menu
using Shift key: move F5,6,7 (mode)
click: center F3+/F4- (roll)