View Templates applied to the view
Filters
Worksets that are turned off
Links that are unloaded
View range or far depth clip
Design Option
Detail level
Phase settings
Autodesk's Revit Visibility Troubleshooting Guide: https://www.autodesk.com/support/technical/article/caas/guidedtroubleshooting/csp/3KGII0aL3ToAA8ArgwyLs4.html