Did you check Configure pop-ups—ArcGIS Pro | ArcGIS Desktop ?
To configure a pop-up for a layer, right-click the layer in the Contents pane and click Configure Pop-ups . This opens the Pop-ups pane where you can define the content for the selected layer.
I'm looking for something like this (Setting the properties of an HTML pop-up display): http://desktop.arcgis.com/en/arcmap/10.3/map/working-with-layers/setting-html-pop-up-properties-for-...
However, I'm using ArcGIS Pro 2.0.0. Is it possible?
My Layer Properties Dialog:
I'm perplexed by the same thing. I was working on my pop ups in AGOL, but the window there is fairly small for using custom HTML formatting.
I was hoping to use Pro for a better interface and found that it didn't even offer the basic text formatting options that AGOL does:
PRO (no font size options??)--I don't see HTML options anywhere, though I recall ArcMap having this capability.
I feel like I'm playing ping pong with myself between the two products!!
Interestingly--I was looking at all of the formatting options in this very post editor. Pretty impressive! Can some of this be replicated in AGOL / Pro (aside from the goofy smile faces etc)??? This would be one heck of a pop up editor!