Finder location of effects?

Greetings - I have a friend with a new iMac (not the M1 version) and a current FCPX install. I was trying to track down an out of date third party plug in to disable. I followed the normal path of User>Movies>Motion Templates>effects to find the errant plugin - but the folder was empty. In fact all of the other folders, Generators, Titles, and Transitions were empty. Also, when I right click on an effect in the effect browser, the "find in library" option is grayed out. I've attached screenshots. Any ideas? Am I missing something?

First, he hasn't downloaded the extra content.
Second, you can't "Open In Motion" any of the built-in or other "coded" templates, only templates made with Motion (yes, you can build with Motion or code them with FxPlug).

Thanks. I will make sure that the additional is downloaded.

Typically, for 3rd party plug-ins, you can select one in the browser, right click and select reveal in finder. As stated that is not the case for the "coded" templates. In my friends scenario, even for the 3rd party plug-ins that option is grayed out and not available. As I mentioned above also, that the effects folder where the 3rd party plug-ins should reside are totally empty, even though the plug ins are visible in the effects browser.

3rd party plugins can be coded, also. Can you name a specific plugin and from what developer?

Looking at your screenshot: you haven't selected an effect (or alike) but a category!
So the popup menu will show something useless in this case.

Also "Motion relevant 3rd party things" can be stored at several main locations:

• /Library/Application Support/Final Cut Pro/Templates.localized/
• ~/Library/Application Support/Final Cut Pro/Templates.localized/
• ~/Movies/Motion Templates.localized/

Other locations are possible as well but never! should be used.
Also keep in mind that those 3 main location only keep the "Motion relevant 3rd party things" means the things which are needed for FCP to "communicate" with the plugin. The actual plugin/code might be stored somewhere else.

The RippleTraining Episode 72: Find Missing Plugins shows how to use my X-Library Check

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Another option to find the plugin path is to export an XML. Then open the XML in a text editor like BBEdit and do a regular expression search, like:
<effect .* name="The Name Of The Plug
The part starting with < and ending with " is the needed phrase and must include the "
It will show the first text line in the XML which cares about your effect. This line should contain uid="somePath/ The Name Of The Plug".
This somePath is the filepath of "Motion relevant" file. Path starting with .../ are effects embedded in the FCP application package.
You can do regular expression search in TextEdit as well but XML formating in TextEdit isn't that nice