It would be really nice to have the configuration of popups retained so that you could disable/enable without losing your custom configs.
- I configure the popup using a "custom attribute display" (rather than the default display "list of attributes")
- I save the web map
- I "remove popup" for testing purposes
- I "enable popup" again
- I go to the configure popup and see that the display has reverted to the default display "list of attributes" and when I switch to "custom attribute display" I see that my previous (saved) configs are gone
This is a duplicate of maintain configuration of disabled popups in web maps