if I go to the Artifacts tab in blue ocean, I can see the artifacts.

However, for each artifact I can only download the artifact.

On the legacy UI, there was a link to view the artifact as well.

For example https://myjenkins/jobname/29/artifact/somefile.txt will download the artifact

https://myjenkins/jobname/29/artifact/somefile.txt/*view*/

will view it in the browser.
I use that feature a lot because I archive certain log files during test runs which are handy to view in the browser.