Selecting "3D View" or "Plan" will change the default view being used

Selecting an option within "Room Walls' will change the elevation view to suit the wall direction

Selected an option within "Projection" will can the view from top view to 3D view.

Clicking "Projection Mode" will do the same as selecting an option within "Projection"

Selecting an option within "Display Mode" will change the view from solid view to wireframe view

Selecting the "Number" within the "Layers" area will hide or show the number of the corresponding items 

Selecting the "Lock" within the "Layers" area will lock the corresponding items. This will prevent the selecting and modifying or these items

Selecting the "Eye" within the "Layers" area will hide or show the corresponding items 

View Mode user guide