Yeah, I agree it's tough to get to know people when you're new at a job and working remotely.
I switched jobs two years ago and the new one is fully remote. I already knew some people in the group, so that really helped. But on top of that, there were a lot of things put in place to help new people integrate.
First, I was assigned a mentor that would meet regularly to walk through the systems and processes, and answer any questions.
There were also daily half hour informal meetings where people could log in to chat. I found them really useful to get to know people.
I'm lucky in that we do field work across the country for a week at a time, in groups ranging from 2-4 people, so there's plenty of opportunity to get to know people better.
Like everything, how working from home is implemented matters. If I wasn't working in such a collaborative environment where there's frequent conversations with coworkers I'd enjoy working from home a lot less.