Click "Customize-Interior Modeling 2.0" and select a room to enter the Modeling interface. Click on the toolbar above "Move", select the shape you need to move. Then press and hold the "→", "←", "↑" key of the keyboard to lock the movement direction in X, Y or Z axis.
Similarly, for most commands, you could also ress and hold the "→", "←", "↑" key of the keyboard to lock the direction.
