Author and Date visibility are shared by native Posts and native Pages, but neither menu says so. Hiding Author in Posts immediately hides it in Pages; Date behaves the same way in either direction and the choice survives reload.
This can look like a separate Pages setting changed on its own.
How to reproduce
- Open native Posts and native Pages.
- In Posts, open Window actions → Show columns.
- Hide Author.
- Inspect Pages and its Show columns menu.
- Author is hidden and unchecked there too.
What should change
Either store separate choices for Posts and Pages, or make the shared scope explicit in both menus:
- Author (shared by Posts and Pages)
- Date (shared by Posts and Pages)
PR #581 takes the second approach and also names each menu section Show columns in Posts or Show columns in Pages.

Author and Date visibility are shared by native Posts and native Pages, but neither menu says so. Hiding Author in Posts immediately hides it in Pages; Date behaves the same way in either direction and the choice survives reload.
This can look like a separate Pages setting changed on its own.
How to reproduce
What should change
Either store separate choices for Posts and Pages, or make the shared scope explicit in both menus:
PR #581 takes the second approach and also names each menu section Show columns in Posts or Show columns in Pages.