No matter if you've just ended your live presentation, or if you don't want any more responses on your survey, it can be useful to turn off access to your Mentimeter presentation. This will display the message "Presentation is closed" if your audience tries to participate in your presentation via menti.com.
How to turn off access
In the Edit view, click Share in the top right corner
Select the Participants tab
Toggle the Enable participation option
If you want to open the presentation again, simply toggle it back.
When voting access is set to "Closed", this is how it will look when your audience tries to join: