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The latest documentation was moved to docs.qfield.org
Tap on a feature on the map to identify it. If several features are located where you tapped (either because there are multiple features really close one to another, or because several layers are overlapping), they will all be listed in the menu that opens on the right of the screen.
Tap on one of the listed feature to access its attributes.
Often it is not required to be able to query every layer. Some layers are only present as basemap and their attributes are not of interest.
You can manage this layerlist in QGIS desktop in
and uncheck the base layers.