You cannot turn off Suggestions on your end, but you can hide Suggestions from the Employee Portal in TINYpulse so your employees will not be able to view Suggestions in real-time. Go to Users and Settings → Settings → Employee Portal. Uncheck the first option: "Stream anonymous Suggestions, initiatives, and Wins to a real-time feed for employees to stay up to date with what is going on in TINYpulse." This way, your employees will not be able to see all Suggestions, just the ones that you’ve determined are In Progress or that have been added as Wins.
If you need to have Suggestions turned off for your organization's account, please reach out to your Customer Success contact or our Support team.