In the name of original fediverse content, here's a little of what I took last year:

Click to see rest:
spoiler

All in Tanzania, taken on this old girl:

They're unedited; I just exported them to avif with ffmpeg.
The most scared I got was on foot, in front of these guys:

Buffalo do not like tourists. Not at any distance. Our park ranger was casually nuts, in the best of ways:

And even he got nervous around them.
Anyway, my takeaway is that big cats are just... housecats. Unless they're guarding a cub/kill, they couldn't care less about tourists, and just lie around and do cat things pretty much like OP's photo.
EDIT
I offer no context:

