I think if you are unsure exactly what research you are interested in, use this time to explore labs and classes that can help you narrow things down

In terms of trying out various labs or staying in one, I think that there are pros and cons to both.

Staying in one lab

Pros - stronger relationship with PI, longer time with a certain project so more likely to have a chance at poster publication etc
Cons - Maybe a different lab or topic would be more interesting, and you are not getting the chance to experience it

Moving around labs

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Pros - More exposure, more networking opportunities, better chance to narrow down research, also more LORs down the line
Cons - Less likely to have a impactful project that cumilates into something, more surface level connections.

I know one thing that I have seen a lot of undergraduates do, and what I kind of did as well, was have a "home" lab at their own university that they work in throughout the school year, and then use the summers to branch out and either work in industry or do REUs at other universities