running macOS 10.15.4
macOS Catalina in Finder — return key while a single file is selected does not switch file into name-editing mode.
this appears to be intermittent, works sometimes but not others.
(Please note: I am experiencing this on a very old MBA11" Early 2014 — I do not recommend running this operating system on this hardware whatsoever. Many of my very strange Catalina problems appear to be related to sluggish performance.)