There was a lawsuit filed by the Trump with regards to the distance requirements for safe viewing of vote counting. The judge overturned a lower court decision on what safe distances would be, and enabled observers to observe from 6 feet instead of 10.

The first source listed corroborates this story (although I haven't found any primary sources or what the exact contents of the complaint were, abcnews seems to be the source that most outlets are referencing https://abcnews.go.com/Politics/pennsylvania-judge-permits-c...).

There doesn't seem to be any truth to observers being removed from any tabulation rooms (or at least I can't find any trustworthy sources). The second source, while claiming this in the headline, is also just referencing the complaint discussed earlier and has twisted that into the headline.