how can I make collapsible form areas always visible? At the moment, when it only has empty readonly fields, the collapsible form area is not being displayed.
At the same time, how can make empty readonly fields always visible, even if they are empty and have to stay empty?
Sounds like you don’t want it to be collapsible if you want it to always be displayed. However, if you do want it to be collapsible, you should make a section break which is collapsible which should work whether or not there are fields within the section. If you want an empty read-only field, you can just make it a Select type and make it read-only, and it will appear like regular text. Just don’t do anything with the field that this fills.