You can configure the "Same-day Booking" scheduling window to be for a day so that no one will be able to book an appointment with you for the same day. To set it up, please follow the below steps.
Step 1. To Modify the time of the earliest booking allowed for your services. Go to the booking page for which you would like to do this setting.
Step 2. Choose the booking page you would like to modify the calendar on.
Step 3. Go to the "Settings" inside your selected live pricing & real-time booking page
Step 4. Click on "Availabilities" to modify when your customers can latest book your service
Step 5. Select by when you would like to allow your customers to book the earliest service with you.
For Example - If you want no one to book an appointment with you for the same day, then select "tomorrow" from the drop-down option.
Don't forget to save your new settings.