Rotate about Scene Floor SOLIDWORKS view option

If a SOLIDWORKS model does not rotate in all directions and there is an axis in the middle of the standard rotation icon, it means that Rotate about Scene Floor is currently enabled.  This option allows the model to rotate about the axis perpendicular to the standard Top plane, as if it is sitting on a floor.

The option Rotate about Scene Floor can be accessed from the View > Modify menu, or by right-clicking on the graphics area of the model.

Rotate About Scene Floor option