How do I remove a marker in Fallout 4

Once a custom marker has been placed, you can remove it by simply attempting to place another marker.

When you opt to place a second marker, a warning message will display, telling you you have already placed a custom marker.

You will be given the option to move the marker, or outright remove it.

As DCShannon points out, the cursor is fond of snapping to nearby markers, so it would be a good idea to ensure you move the cursor to a clearing to bring up the remove marker option.

To remove a marker on Xbox One:

• Open your Pipboy by pressing B.
• Use RT or LT to select the "Map" tab.
• Move your left joystick to move the cursor to an open area of the map.
• Press A. You should be prompted with a dialog box asking if you want to move the current marker or remove it. Select "Remove Marker".

Here's a YouTube video I found that shows the process in action: