Signature Scope Not Restricted to View and Level Display
A signature includes all elements in the file or model. View attributes that are turned off, such as display of cells, text, dimensions, constructions, or tags, and view parameters, such as window area and clipping planes, are included in the scope of the signature. Similarly, all levels are included – regardless of whether they are displayed. In summary, all elements are signed even if no views are open and all levels are off.