It's not configurable currently.
Is there an update. I would like to use different colors or Icons.
Hi Anton, is there a feature request for this, and if not, can I create one?
There could be one. I recommend searching.
Hi Anton, I do not get it. What do you mean by "I recommend searching". In the KML file i defined a color for a Track here #red
 <Placemark>
                    <visibility>0</visibility>
                    <open>0</open>
                    <styleUrl>#red</styleUrl>
                    <name>superhexe</name>
                    <description>Track no. 1</description>
                    <LineString>
                        <extrude>true</extrude>
                        <tessellate>true</tessellate>
                        <altitudeMode>clampToGround</altitudeMode>
                        <coordinates>
                               xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
but the POIs is still in cyan.
Anton has confirmed its not yet currently supported however the relevant feature request is open on Github for the Traccar-Web interface element
https://github.com/traccar/traccar-web/issues/1128
Be great to have extra support for the feature request.
Is it possible to define the color of a track within the POI Layer KML File - mine all appear as ligthblue (with dots) depsite them referencing a different style within the file (which works in Google Earth).