Allow Sorting and Searching (TestFilter)

I use TestFilter as a means to allow only certain feature classes to be downloaded from an ArcGIS enterprise geodatabase. If I didn't have TestFilter populated with the specified feature classes, someone could conceivably guess the name of a non-public feature class and download it. I have well over a hundred feature classes listed in TestFilter. When I need to find one of the feature classes, or have added one or more feature classes, things get messy real fast when trying to locate a specific feature class. If sorting and/or searching (including wildcard) was enabled on TestFilter, my task would be much easier. Thanks!