Personally I've never seen a "pro-Hamas" sign, I have no doubt someone somewhere has one. Ive seen plenty of "Free Palastine" signs be called anti-semitic though, despite showing support for the people versus a government.
I've seen two.
The protesters at UW organized a protest for palestine on Oct 12th with the Hamas glider in its poster. Many people joined the protest.
5 days after the massacre!
You can see the poster here: https://komonews.com/news/local/israel-hamas-war-palestine-g...
The pro-palestine protest in San Francisco was chanting "From the river to the sea"
That of course is not applicable to these sit-ins, although I wouldn't want to support them either.