This can be done via the Business Dashboard using the Settings.
Follow the steps given below:
1. Select Settings from the dashboard navigation.

2. Scroll down to the Online Ordering section.

3. Go to Ordering Basics and scroll to the Dine-in section.

4. Here you can use the toggle button to activate or deactivate Dine-in for your Thrive restaurant site. Further, please select the type as QSR to enable the same.
5. Click Save Changes once you've completed the edits.