From strict to moderate for existing booking

[Marusa0]

want my guests to be able to be refunded fully  if they decide to cancel for this Summer.

big troubles with the first guest, we both didn’t get any usable help..... 

since the platform is stuck I really would like to do it in advance for future possible cancellations. 
does anyone know, how this could done? 

[Sarah977]

@Marusa0  Just go to your booking settings and change your policy from strict to moderate. It will only affect bookings made after that time, the ones you already have on your calendar would still be under the policy in place when they booked.