Hello David

I see you're mentioning you changed the amount of busy events returned to 1000, so this should already be enabled:

That's the only thing telling Amelia to remove the busy slots found in Google Calendar.

Also, since Amelia adds the slots on Google Calendar, I don't know why it's not working the other way.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.

Hi again Adam

I'm glad to hear the issue is resolved, although it should work when you set it to "All day" as well. I just tested it for one of my accounts, and it did block the whole day from Amelia.