1. In the Main Dashboard, click on the "Event App"

2. Click on the "Settings" tab

3. Under the meetings dropdown, Click the "Flexible Scheduling" checbox to enable attendees to select custom time while booking a meeting

4. Once the checkbox is ticked, click on the "Save" button to save the setting.

5. To disable this option, Click the "Flexible Scheduling" checkbox.

6. Once its unchecked, click on the "Save" button