Per the Dynmap wiki:
Coord Component
This component is used to show the world coordinates corresponding to the position of the mouse pointer. The component is defined via the following lines in the components section:
- class: org.dynmap.ClientComponent
type: coord
label: "Location"
hidey: false
show-mcr: false
The settings for the component are as follows:
label : this allows control of the label used on the control presenting the coordiates. Default is 'x,y,z'.
hidey : this option, if defined and set to true, makes the coordinate control only show X,Z coordinates.
show-mcr : this option, if defined and set to true, causes the display of the Mincraft Region file ID for the current location.
If you want to remove the whole coord window, remove
- class: org.dynmap.ClientComponent
type: coord
label: "Location"
hidey: false
show-mcr: false
in its entirety from the config.