Hold & drag right-mouse button.
Hold & drag middle mouse button, or click & drag pan icon in the top bar.
Scroll wheel, or click zoom in/out icon in the top bar.
Choose pre-defined view from the “Orientation” dropdown in the top bar.
Choose between first and third-person from the “Camera mode” dropdown in the top bar.
Choose between 3D and 2D from the “Perspective” dropdown in the top bar.
Move using W A S D keys, click and hold right mouse button to look around.