I am using the most recent version of ArcGIS Pro. I primarily am using hosted feature layers but I also have a few local files and services. When I use the explore tool to identify pop-ups I get mixed results. When I click on something I get the identifying box that acts like its working and something even flashes that was identified but the pop-up panel stays blank. Sometimes it will display properly but always. I have the tool set to visible layers so I would expect in most situations to have at least 3 or layers that should give me popup information but it usually doesn't. I am happy to provide additional information but I wasn't sure what all would be needed to help figure this out. I would prefer not to have a support case for this but maybe it is a bug.
Can you create a Pro project with file gdb feature classes and enterprise (SDE) layers to see if the popups work properly on those data sources?
I looked into this a little bit. I discovered I actually had some files related to SDE. I removed those as they aren't kept updated anymore and switched to hosted feature layers. I have some local files and some from a local geodatabase. I still have the same behavior. I tried switching the Explore tool to the top most layer and have no issue but of course I only get that top layer identified. I'm wondering if the Explore tool/pop-up results have a limit on how many features it can show popups on at once. Selected in Contents also seems to work just fine. I really like the visible layers option as that way I don't have to worry about changing everything every time I want to get a popup for a different layer though.