Steam Deck...Could not find any non-steam apps

I have gotten this installed properly.  sgdb://boop/test works fine.
I am trying to install artwork using the "Apply with Boop" button but all I get is

SGDBoop Error <2>
Could not find any non-steam apps

I do have non-steam apps...not sure what to configure to get it to find the proper locations in steam on the Steam Deck.

Any thoughts, suggestions?

Thanks.