I have a map with three layers - all the same data source but with different filters showing Groups A, B, and C. Each layer has different pop-ups, with wildly different information, including links. All in all, it was easier to create copies of the data source rather than creating expressions for each. But in order for the legend to be clean, I put all three symbologies on one layer. But because that layer has a filter, the record count for two of the groups is 0. Well now, the legend is only showing the one group with a record count even though my symbology is set for all three.
How can I change this? Even in other maps, I need it to show all options, even if those options aren't present currently, so that people know the options available.