Limit editable fields?

Limit editable fields?

I see that in Zoho versions in the past you could limit editing to only the visible fields in a report, but it appears this is no longer a feature. But, is it still possible? For example, I have 20 fields, but I want my field technicians to only be able to edit 5 of the 20 when they login. Right now, they would login and be able to edit all 20 fields, but I want the other 15 fields to either not be seen, or at very least, not be editable.