On behalf of a customer from Germany let me add the following wish:
Make slab not visible outside View Range
Currently regarding:
About the View Range
https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2017/EN...
Elements Below the Bottom Clip Plane and Within the View Depth Elements within the view depth are drawn using the line style regardless of the element's category. Exceptions: Floors, structural floors, stairs, and ramps located outside the view range use an adjusted range that is 4 feet (about 1.22 meters) below the bottom of the primary range. Within this adjusted range, the elements are drawn using the projection line weight for the category. If they exist outside this adjusted range but within the view depth, these elements are drawn using the line style.

Previous form thread
floor slab out of range displayed