Years ago I wrote a Unity editor extension that adds scene view bookmarks, allowing you to quickly return the scene camera to preset positions. Recently I revisited this script and converted it to a package. Now instead of importing it to your Assets folder, add it to your project with Unity’s package manager (installation instructions here).
I also took the opportunity to make the Set Bookmark and Move to Bookmark options available via a scene overlay. Introduced in Unity 2021.2, overlays are a nifty way to add custom widgets to the Scene window. The dropdown shows the same options as the Window > Scene View Bookmarks menu, but now it’s closer to the action.