Hold settings let you hold the current Mode & temperature settings for a desired period of time.
A. 'Hold till next schedule' lets you hold the current settings until the next schedule begins (if any).
B. 'Hold till a specific time' lets you hold the current settings for a specific time from 1 hour until 24 hours.
C. 'Permanent Hold' lets you hold the current settings until you manually change them.
D. 'Do not Hold' will not hold the current settings. Your schedules or geofencing will work as intended (if any).