Hi MichaelHenderson.,
Thanks for your patience !!
The time slots available on the front end are based on the service time( 45 Mins ) that you have selected.
Refer: https://prnt.sc/J4ricM_toYOz
Kindly refer to the screenshot https://prnt.sc/T0VsaZHBqsAz and make changes to schedule options to hold therapists available time slots.