How to prevent users from making appointments in time zones other than the business's time zone:
If your client's business operates in close proximity to a time zone boundary or within a bustling tourist destination frequented by visitors from various time zones, it's advisable to implement measures to restrict appointment bookings based on the client's local time zone rather than the visitor's.
To prevent people from being able to book appointments in their own time zones please head into:
Settings > Select the Business Info tab > Scroll down and activate the "Disable Contact Time zone" checkbox.
With the "Disable Contact Time zone" box selected, users will no longer see the time zone dropdown selector in the calendar widget (see screenshot below), and all appointments will be made in whatever time zone is set within the location settings.
To see which timezone the location is set to please head into the Location Settings > Business Info> Time Zone field.
The screenshot shows after you have selected the "Disable Contact Time zone" checkbox on the calendar widget