- in Design mode under Markers: click **Add marker**, then click on the newly added entry to configure the marker.
Using the black context menu, you can reorder or remove existing markers.
- in Run mode: click **Add marker** and drag the new marker to the desired position.
While it's "selected", a popover toolbar will appear, allowing you to configure it, edit its YAML, copy it (a Paste button will then appear besides **Add Marker**), or remove it.
To position markers accurately, it's usually best to do it in Run mode, while the Markers area in Design mode is best for an overview of the markers on the page.