So i am assuming that in Viability Graphics and Filters they are not being hidden intentionally or set as such in a View Template!
Make sure the plan view and the elevation views are under the same phase.
Also make sure the view has a scale larger than the elevation's "Hide at scales coarser than:" limit.

Finally is it just a glitch? If you create a new floor plan do they appear?
Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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