I don't think I've ever had a successful All Smart Search from the Android App.
Something always goes (went) wrong. Try (tried) again to no avail.
Strangely enough, I do get a return from a resource-limited Books. Anyone else? Google Pixel 3a 6a 9
to eliminate possible factors it works fine on my iPhone - so not a generic mobile issue, could be Android specific.
Works fine on my Android phone and tablet.
Thanks. Strange stuff. I've sent in a bug report and Logos is on the case. (boom emoji!)