Hello there - we did release an update around this in late February. Apologies for not closing this idea. 
Please see the release notes here. 

"We resolved a logic issue where blank availability days could incorrectly display as Open All Day. Previously, if a pro was truly unavailable, they had to set both Available and Unavailable times, which was restrictive and cumbersome.

Going forward, blank days will display as Unavailable when availability intervals are set on one or more other days. A day will only be considered Open All Day if no availability intervals are set for any day of the week.

Learn more: Instructor Availability"

Hi there! I'm interested in understanding what this means. Can you please edit your post and add more information or an example scenario? 

Guests for lessons is almost ready to go - if you're interested in being an early access user, please contact our customer success team and let them know "I want to be an early access user for adding lessons to guests!" 

This is possible with our new Email Campaign feature! It's releasing in the next month to all customers, but if you would like early access, please reach out to our Customer Success team and we can add you to beta.