This is pretty crude and quick
You need VBA to add a tag to a shape, since you can't do it from the UI so select a shape and run SetTag
To flip the visibility of the shape, FlipTags reverses the state. There's also a ShowAll and a HideAll macro
Option Explicit
'https://learn.microsoft.com/en-us/office/dev/add-ins/powerpoint/tagging-presentations-slides-shapes
Sub SetTag()
Call ActiveWindow.Selection.ShapeRange.Tags.Add("admin", "yes")
End Sub
Sub FlipTags()
Dim oSlide As Slide
Dim oShape As Shape
For Each oSlide In ActivePresentation.Slides
For Each oShape In oSlide.Shapes
If oShape.Tags.Item("admin") = "yes" Then oShape.Visible = Not oShape.Visible
Next
Next
End Sub
Sub ShowAll()
Dim oSlide As Slide
Dim oShape As Shape
For Each oSlide In ActivePresentation.Slides
For Each oShape In oSlide.Shapes
If oShape.Tags.Item("admin") = "yes" Then oShape.Visible = msoTrue
Next
Next
End Sub
Sub HideAll()
Dim oSlide As Slide
Dim oShape As Shape
For Each oSlide In ActivePresentation.Slides
For Each oShape In oSlide.Shapes
If oShape.Tags.Item("admin") = "yes" Then oShape.Visible = msoFalse
Next
Next
End Sub
If you really want to get fancy, you can make this selectively show/hide macros, add a macro button to a slide to only flip on that slide, etc.