“Hey! What happened to my elevations & sections?”
You’re in Revit SO The Items such as elevation markers, section markers, and callouts are no longer just dumb blocks: they’re linked to the actual view they’re calling out. If you delete one of these markers, you’ll delete the view associated with it. If you and your design team have been working on that view, then you’ve lost that view. Also, you must move any item deliberately and with caution. The elevation marker you moved in the previous exercise has two Parts: the little triangle is the elevation, and the little box is the part of the marker that records the sheet number on which the elevation will wind up. If you don’t move both items together by placing a window around them, the elevation’s origin will remain in its original position. When this happens, your elevation will look like a section, and it will be hard to determine how the section occurred.