When I viewed a Google Sheet, I was able to see the Protected Sheets and Ranges option on my sheet.
If you're not seeing this it may have something to do with your account or how the sheet is shared with you. You'll want to contact Google for help with figuring this out though as we're very limited in what we can help with here as Google Sheets is not our platform.
Let us know if you have any questions about Jotform.