Depending on the service to be booked, it can be specified whether the available days are displayed in list or calendar form on the second page of the online appointment booking page.
To do this, click on the desired service under Company > Services and then go to the "Service-specific settings" tab.
If you use the "Global setting" option, the setting that you set in the tab Scheduling Page > Settings > Advanced Settings > Layout "Available Days" will be used. By default, "Global setting" is stored in the service and the setting "Calendar" in the layout.
For example, if you offer seminars or courses with only a few dates, it may make sense to change the setting to List accordingly.