In order to avoid custom Field Map forms disappearing I open the web map from within the web field maps interface to make whatever changes I need (symbology etc.) and save and close. This makes the underlying web map setting uncheck the check box for "Find Locations" (that allows search by attribute)....without me doing anything.
In order to fix this I close the Field Maps web interface and open the Web map in MyContent. I check the box for Find Locations (again) and save. This causes my custom field map form to disappear so I close the web map and go back to the form and recreate the custom form.
and so on...every time I need to change a web map.....
These two events may be independent..I'm not at all sure why these two things keep happening.
Does anyone know a way around this? I have related tables so I have to use Classic Map Viewer and I am using ArcGIS Enterprise 10.9
Thanks