It made major headlines, I'm surprised you're so far out of the loop you never heard about it. The link to a Google search I provided for you makes it easy to find the EO:
https://trumpwhitehouse.archives.gov/presidential-actions/ex...
https://trumpwhitehouse.archives.gov/presidential-actions/ex...
> Did not create new law
Right, it had no effect, just more signalling from Trump. He sought to increase the legal responsibility of social media companies for what their users say, exposing them to lawsuits, in effect silencing and canceling users.