I ended up doing an upgrade with my express upgrade disk which kept all my files and took about an hour and a half.
After which the network problem was solved. Both computers seeing and connecting to each other, including the printer.
Dell XPS 13 9370 (2018) review
No need to scan sketches into your computer with Moleskine's new smart pen
WWDC history: Apple's product launches since 2005
Comment importer des contacts d’un iPhone à un autre iPhone ?