Hi @Anna,
Sorry for the delay!
If you aren’t able to navigate directly to the form definition for a given table, that means you do not currently have a view definition created for it and that it is using the default view. You will need to add a new view definition to your form definition in App Resources.
If you can go directly to the form definition from the 
on Collection Object, you can simply add the view definition to that form definition and it should appear for you.