You can delete unused scene markers.
How to delete scene markers
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In the timeline ruler, click on the scene marker you want to delete.
NOTE When a scene marker is selected, its outline will turn cyan, and other scene markers will become slightly darker. -
If you want to delete several scene markers, hold the Shift key and click on every other scene marker you want to delete to add them to the selection.
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Right-click on the timeline ruler and, in the context menu, select Scene Markers > Delete Scene Marker.
NOTE Do not attempt to delete scene markers by pressing the Del key, as that will delete the currently selected element in your scene instead.