I have been on a number of Zoom calls, mostly work related, but also with friends and groups I'm part of.
With work, most people seem to dial in from a desk or table. Sometimes even the garden.
On the others I've seen people propped up on their bed, which includes in a work quiz and a group meeting where I hadn't "met" or spoken to a few of the other people before. If it was just friends I'd find it less strange.
Not a big deal and not having a go, just interested.
I think working from home has meant that many of us see into one another's homes when we wouldn't usually.