Start Calendar Display Without Calendars Checked?

We have a Resource Calendar that displays all our Google Workspace calendar resources. It is a massive cluster. I built it, and even I can’t stand to use it. Because everything is checked by default, it’s tough if you only want to look at the availability within a certain calendar.

Is there any way to set the display to have a bunch of calendars available, but start off with them all not checked? Or even only just one checked?

The page I need help with: [log in to see the link]