I've used
Navionics for 10 years now, and I don't think there is a way to deselect certain data that you no longer want to see. There is however an "Easy View" option under map Options that enlarges some fonts and suppresses some of the chart details and
depth markers to declutter a chart view. But you can't move things in or out of that view, it's either On or Off.
You can approach this the other way - Navionics does let you place pins and icons anywhere you want. I sometimes do this at favored alternate
anchorages on the way somewhere so they are easy to pick out at a glance if I got caught in
weather or was looking at a lee shore/wind direction/swell condition I didn't expect.