By default, surnames are shown for everyone in the tree (as long as they have been entered).
If you need to save space, then a surname can be hidden for a particular person. To do this, click on the relevant person in edit chart mode. Then click on the “…” button, or right-click on them.
Select “Toggle Surname” from the pop-up menu that appears.
Alternatively, if space is tight throughout the chart, then most surnames can be turned off in one action. In chart editing mode, select the “Layout” tab from the “Chart Properties” paenl. Then turn off the “Always include surnames” check box. Most surnames will then disappear on the chart. The rule that those who have children will have their surnames included.
Note: If the “Always include surnames” is turned off, the step described first, i.e. toggling a surname will have the opposite effect, it will toggle a surname on, if it were usually off!