I am working with Explorer for ArcGIS (Beta) ver 20.1.0 on Android phones. I created a web map on ArcGIS Online that includes a map service configured to search by layers as shown below:

I should have searched for all the features matching the above configuration. But in fact, I only search for the first configured layer (here is Water Service Connection), the rest cannot. Has anyone ever encountered this problem?
P/s: The search feature returns the correct results for all layers when using Explorer on iOS devices.
Thanks for any help you can provide.
Thao Nguyen.