How to eliminate duplicate icons in Applications folder

Your screenshot is not of the Applications folder, but rather of the Apps app (the macOS Tahoe replacement for Launchpad, also accessible via Spotlight).

Since that view is driven by Spotlight, you need to rebuild your Spotlight index:

Rebuild the Spotlight index on your Mac - Apple Support

If that doesn’t work, Copy/Paste this into Terminal. sudo will ask for your password. Just type the password and hit return. It won't show anything on screen. Those two commands essentially nuke all the Spotlight records then force a reindex. You may need to restart or log out/in after running the commands.

sudo mdutil -X /; sudo mdutil -i on /

To eliminate duplicate actual app files in your Mac's Applications folder, open Finder, click Applications, sort items by name or date, right-click the old or extra app copy, and select Move to Trash.