How do I get a map for my Garmin Dakota without shading?

Most of the map sources listed here don't contain hill shade https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/Download Further you may have a dedicated hill shade map enabled, obviously you should disable it if you don't want it displayed.

I have used a few Garmin GPSes but not a Dakota. Many of the them have map settings to modify the detail shown. Look at the map/ settings and see if there are any options you can try. Please let us know if they solve the problem. There seems to be a few websites that are offering PDF manuals of older devices, even if Garmin no longer host them. You could even ask Garmin for advice. Later devices:-