Garageband - I want to use the AU Plugins

While I have used GarageBand for a while, I am just now starting to reach out and expand my knowledge of recording. I am running Sonoma 14.5 and GarageBand 10.4.11.

I have looked at videos of how to use the AU plugins that are in GarageBand. They always show clicking on the plugins button and getting a list of all the available plugins. On my screen when I click on plugins, it doesn't provide a list, but rather blue Compressor and Channel EQ buttons that only allow you to change the settings for the standard compressor product. So maybe something isn't installed? I have sort of hit a wall so I'm reaching out to see if there is something I need to do so that the plugins show up on the plugin button.

Also, I have the "enable Audio Units" box ticked in settings.

Here is what I see when I click on Plugins:

When I click on Compressor, I get this, which seems to be the settings that drive the normal GB compressor.

So as you see, I don't get the list that the videos show.

Thank you for your consideration in this problem! Any help is appreciated.