It seems that editing the data on the web interface is only possible by going through the form as a respondent would do. I would need to add information in fields that is empty because of skip logic, but even when editing the data the skip logic is active and prevents that I see these fields.
Is there a way how to deactivate it just for editing and let the editors access all fields?
There are two ways to edit submissions. The first is to edit each submission individually, which is probably what you are doing, via this:
This will basically fire up the Enketo web client, prefill a new submission with the existing submission data, and effectively resubmit (!) As such, any existing skip logic in the form, constraints, etc will continue to be enforced, which will cause previously hidden fields to remain so.
What you probably want to do instead is edit the raw data. You can do this by selecting the specific submission, and then performing a bulk edit on it, via this:
You can then directly edit any fields as desired.
