Navigate to the 1:1 you need to reschedule.
Select Edit Schedule.
Type in a date or click the calendar to choose a time to reschedule your upcoming 1:1.
If necessary, use the Repeats drop-down to change the recurrence of your 1:1.
Select Save.
When saving, you'll be asked which meetings you're trying to reschedule.
Just this meeting - Reschedules only your upcoming 1:1, future meetings will remain scheduled as-is.
This and all future meetings - Reschedules your upcoming 1:1 and all future instances according to the recurrence you've selected.
Only future meetings - Reschedules only future meetings according to the recurrence you've selected and the date you've chosen. Use this if you want to keep your upcoming 1:1 meeting scheduled as is but need to preemptively push other 1:1s forward on your calendar.