Option 1

1. Click on the Edit button;

1. Mouse hover the Marker you want to delete, and click on the markert, then on trash icon to delete the Marker;
2. A message will appear requesting your confirmation. Click Ok and the web part will refresh and the Marker will be removed.

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Option 2

1. Click on the Edit button;

1. On the web part sidebar and click the Manage Maps icon;
2. The list of Marker will appear. Click the trash icon to delete the Marker;
3. A message will appear requesting your confirmation. Click Ok and the web part will refresh and the Marker will be removed.