When ProBuilder package is installed, things like BoxCollider (any many many more) are missing from Gizmos menu. Some icons like AudioSource are missing as well. Discussed in this thread: https://forum.unity.com/threads/cant-hide-gizmos-in-scene-view.651166/ Confirmed ProBuilder versions: 5.0.1 Confirmed Unity versions: 2021.1.0, 2020.2.7 Confirmed by multiple people, happens to me as well. Happened to me for quite some time (at least half a year), found out just recently it's caused by ProBuilder. I tried deleting Library folder and deleting all my scripts, that did not solve the issue. Removing ProBuilder package fixes the issue. Please fix this, it's annoying not to be able to hide collider gizmos (they are not hidden even when component is collapsed in inspector). This is the reason I've removed ProBuilder package from project until it's fixed.