Every custom section carries two names: the plural on the sidebar heading and the singular on each entry. You can change both. The control is easy to walk past, so this is the exact path.
Open Organize sections
- Open World and hover the section heading in the sidebar.
- Choose the three dots that appear beside it.
- Select Organize sections....

The three dots stay hidden until you hover. The entry count sits in the same spot until then.
Change the two names
- Click the section name in the list.
- Enter the plural under Section (plural).
- Enter the singular under Each entry (singular).
- Choose Save.

On the sidebar, a section you call Deities can label every entry a Deity. Saga20 figures out the singular form from whatever name you enter. A name that has no plural ending, like Bestiary, starts with that same word twice, and this field lets you correct it.
Names apply to one campaign, so each table can use its own vocabulary. Anything from 1 to 60 characters is accepted.
What else this panel does

Drag the handle to move a section, and click the eye to hide a section you are not using. When you hide a section, the entries stay and only the section leaves the sidebar. To get it back, select New..., then Hidden sections.
Custom sections have more controls. Click the icon to change it, and use the three dots on the row to edit the page template new entries start from, or to delete the section.
The built-in sections are Characters, NPCs, Locations, Maps, Factions, and Items. You can reorder and hide them, but their names cannot change.
To build a section of your own, read Create a custom world section. For the entries that go inside it, read Create and edit world entries.
