I use Google Calendar for work, and I often need to check certain groups of people's calendars for availability when scheduling things. Is there a way to group a few individuals' calendars into a group like "research team" and group another selection of people into another group like "product team" so that I can show / hide that combination of people's calendars with a single click?
Google Calendar doesn't include that as a feature.
One solution could be to use the embed calendar customization tool but this will require to embed the calendar on a web page. For details see Add a Google calendar to your website
Another solution could be to use a user-script. I didn't tried this yet.