Hi Laura, this is the default settings for the ACARS map to show when there is only 1 flight going on, since it was focusing only on that specific flight. However if you have 2 flights going on, the ACARS map won't zoom in to the max like the first image and will be like the second image
And about the 'Taxiing to Runway' issue, this is because KAcars stop sending information to the map after you closed it, so the information flow was stopped. If you want to remove your flight from the map manually you can always go to Admin Center > Site & Settings > Maintenance Options > Reset ACARS. Selecting this option will remove all inactive flights from the map, flights that are still going on will appear again on the map about a minute later.
Or if you want the map to automatically remove finished flights after a specific time, go to local.config.php in the Core folder and change the settings
# ACARS options
# Minutes, flights to show on the ACARS
# Default is 720 minutes (12 hours)
Config::Set('ACARS_LIVE_TIME', 720); <-----Change this
Config::Set('ACARS_DEBUG', false);
Hope this helps