Why can't I see anything?
The HyperX Viewport offers a model-centric workspace upon which to set up Sizing/Analysis and view results. If you aren't seeing a model in the Viewport, then you may still need to import one. If a FEM is imported and you can't find it, use the View Cube and/or other Viewport Controls to find the model in 3d space.
How do I save changes?
HyperX automatically saves after most operations made in the Viewport. When working on specific forms, there are buttons to save changes including general ones like "Apply", "OK", etc. If you attempt to close a form without saving, you will be prompted to save changes first.
How do I undo changes?
HyperX does not support a general "Undo" function. Un-doing operations typically involves manually correcting saved changes. For instance, assigning a new Property to overwrite an incorrect assignment or deleting a Structure and creating a new one based on updated Zones.