Small bug-ish thing:
in the new Desktop, when I take a 3.5.x database, upgrade to 4.2.x, APOC is still installed as 3.5.x. The right column for plugins still shows APOC compatible version as 3.5.x instead of 4.x APOC. Neo4j 4 cant start with APOC 3.x jar in the plugins dir. Complains about missing host in settings. Not a helpful or correct warning. Deleting the 3.5. APOC jar out of the local db plugins dir was the only way to fix this issue.