This is a simple observing list capability that let your prepare in advance a list of object to observe.
You can filter the visible objects using a few criteria, sort the list on any column, advance to the next or previous object.

You can start with an empty list and add the object from the chart right click menu.

Or create an initial file with a title line followed by the object name on every next lines, like this Messier list example. The coordinates are added when the file is first loaded.

Don't forget to Save the file after you make some change.
The Clear button allow to start a new empty file with the default name.
The Update coordinate button refresh the coordinates from the Skychart catalogs.

The object from the list can get a special label to distinguish them, check “Mark objects on the chart” for that.
The other checkbox “Always show the objects from the list” is to be use in special case when the objects are very faint and you want to show them on large scale chart. Beware this option can severely degrade the performance.

The RA and DEC column are the object coordinates as read from the catalogs. Both are show in degree units.

You can enter a free text in the Description column. For example the time of observation during your Messier marathon.

The Start and End Time are computed based on the filter selection.