Find all keynote files on mac

If you have Presentations selected in the Spotlight Search Results categories in System Preferences, then a Spotlight query can find your keynote (.key) files. If it wasn't selected, select it, and then drag/drop your startup drive (e.g. Macintosh HD) icon onto the Spotlight Preferences > Privacy window. Wait a minute and then select and remove it [-] from that panel. Spotlight will now reindex your drive and this time, index those Keynote presentations. If you click the Spotlight icon 🔍 in the menu extras area, you will see an indexing progress bar. You don't need to type anything to see this progress:

Before you invoke Spotlight, consider a change to Finder's Preferences > Advanced pane:

When performing a search: [ Search the Current Folder  ↕︎ ]

And in the Finder View menu > Show Path Bar and when you click on a discovered Keynote file, you can see its path at the bottom of the Finder window.

Open a new Finder window and set your directory location to the Desktop. In the Finder search field, enter the following:

kind:keynote

You will have a Search: This Mac "Desktop" sub-toolbar. If you get no results on the Desktop, click "This Mac".

Erase and reinstall seems to be a broken record with Apple Support. As Spotlight is part of macOS, there is no separate community for it, and we can continue to discuss it right here in these threads within the Big Sur community.

If you have found a solution to find all of your .key files, that is all well and good, though a working Spotlight solution would be useful too.

You are welcome. All of my Big Sur updates through 11.6.2 have had no Spotlight issues, nor with Monterey 12.1. There should be no reason to erase your hard drive to resolve Spotlight search issues.