I propose that in the Map Viewer, the existing WFS loader invoked by Add -> Add Layer from URL is improved to add multiple feature layes at the same time from the same service when setting up a connection, see figure WFS1. Currently, only one feature layer can be added at the same time which is annoying. Because, often, you want to load many feature layers from the same host, see figure WFS2.
When loading many feature layers, of course, they should appear in different colors.
A link to a Danish WFS for your development is here:
https://geoserver.plandata.dk/geoserver/wfs?servicename=wfs&request=getcapabilities&service=wfs
When adding it, I suggest you specify a BBOX custom parameter with the value
692848, 6170985,703408,6177176 to limit the number of features loaded.
Kind regards, Thomas Balstroem, Univ. of Copenhagen, Denmark