I have a 396. Don't like it as much as my 390. Also prefer my 395. I use a custom map theme in eacj taht I made with
https://www.pinns.co.uk/osm/theme_editor.html

I do have the PDF for the 395. Thanks for the offer!
I have every map layer andmap tool enabled but still only one dashboard.

I am beginning to think the Garmin engeneers just forgot to implement the Dashboards setting page on the 395.

This is really Strange: The 390 has 2 less dashboard files than the 395!

Searching Garmin online help for the 390 comes up with instructions for setting dashboard but searching online help for 395 does not.
Here is a screenshot of the dasboards folder in the 395.

After looking trhough the 395 manual I found no mention of dashboards. I went to my 390 manual but there is no mention there either. However, I noticed the manual I have for the 390 is labeled Zumo 300 Series - not 390. Apparently there is no manual specific to the 390!

By the way I do appreciate ...

Yes I have Map Tools enabled on my 395 and it works and looks like your 595.
Here are screenshots from of my 390 of preferred dashboard, the menu item for dashboards and the dashboard configuration page with one of the 8 differrent available dashboards.

No no answer. The dashboard is the line of data items along the bottom of the naviggation screen.
The dashbaord I preferhas Trip A Mileagfe, Elevation, Time Speed and these can each be changed to different data. Other dashborads have differnt configurations of various selectable data. Some are ...

On my ZUMO 390 I can choose among several dashboards. My 395 also has a dashboards folder but there is no menu item in settings/map to slect a dashboard. Am I missing something or is there a way to fix this?

I still prefer to create route in Mapsource. I will then import them into Basecamp and then export as a KML file which I import into Google My maps.
I can then check the route for any road bloacks or traaffic problems. This I learned from a member on this forum.