I've done investigations with law enforcement before, and you're right, it is more electronic, but basically it's the same as what you see in the movies just on a screen (so it's searchable). But the software basically has you build clusters of people with evidentiary links.
But it was developed to mimic the old bulletin boards, which looked like what you see in the movies. And also the software is really expensive, so "hobbyist" investigators still do use the bulletin boards and yarn, because the electronic version is too pricy.
[1] https://docs.i2group.com/anb/9.4.1/analysts_notebook_welcome... [2] https://www.thomsonreuters.ca/en/case-notebook.html