You can modify the current map markers list in the Map Markers task pane. You can:
You can change the name of any marker group or marker (named or unnamed).
Right-click the group name or marker name.
Click Rename.
Enter the new name for the marker or group.
Right-click any icon on the map and then click Edit Map Marker Name. Enter the new meaning for the icon in the Map Markers task pane.
You may not change the names of the General Icon or General Text Markers groups, but you may change the names of the markers they contain. When you name icon markers, they are automatically moved to the Single Icons group.
Make markers within groups mutually exclusive ▼
Markers within each group can be mutually exclusive (only one marker from this group can be used on a topic) or not (multiple markers from this group can be used on a topic). You can change this attribute only for user-defined icon marker groups.
In the Map Markers task pane, right-click the marker group name.
Click Mutually exclusive.
You can change a marker's icon, text or color or assign the marker to a different group. General icons cannot be modified in this way. However, you can re-name them and/or drag them to another marker group.
Right-click on the marker.
Click Modify.
Do any of the following:
Select a new group for the marker.
You may not re-assign markers from or to mandatory groups (Task priorities, Task Complete (%), Single Icons, General Icons, General Text Markers, Font Colors, Fill Colors).
Enter a new name for the marker.
Select a new icon, fill color or font color for the marker.
You can drag a marker to a new group.
Right click the group name.
Click Sort Markers.
The group will be sorted in ascending alphanumeric order.
Delete markers or marker groups from the list ▼
You can delete entire groups of markers from the list, or individual markers from any group. If the deleted marker(s) is not used on the map, it is deleted from the list. If the marker is used on the map, it is changed to an unnamed (general) marker.
Right-click the group or marker name.
Click Delete.
You cannot delete any of the mandatory marker groups (Task priorities, Task complete, Resources, Single icons, General icons, General text markers, Fill colors, Font colors)
If you delete an icon or text marker group but have used some of its markers on the map, the "orphaned" markers will be added to the General icons or General text markers groups.