MOVE: Left-click and drag anywhere (keep holding the button).
ZOOM IN/OUT: Hold left-click, then scroll the mouse wheel up/down.
OPEN MENU: Right-click the model.
CLOSE APP: With the game window focused(for focus the game click on the model)
press Alt + F4. (Temporary—an in-menu “Exit” button is coming soon.)
CONTROLS GUIDE
Source: Steam Community (opens in a new tab)