Change time or instructor across many sessions at once, or cancel a batch with one click.
Classes → [Class Template] → scroll to Upcoming Sessions.
Top-right of the list. Checkboxes appear next to each session — tick the ones you want or use Select all.
The floating action bar shows Edit time / instructor and Cancel N sessions. The edit dialog lets you change time, instructor, or both — only the fields you opt into get rewritten.
Both edit and cancel dialogs include the "Email confirmed members" opt-out (default ON). Members get a single, clean reschedule or cancellation email per session.