You can normally access this dialog by choosing the "Format | Style..." menu
The main menu or simply menu is a horizontal bar with clickable commands anchored to the top of the main window of Atlantis:
command or clicking the Style button of the Paragraph toolbar , then clicking the New... or Modify... button.
The Name box tells the style's name. Note that you cannot change name of the built-in styles ("Normal", "Heading 1", etc).
When a style is not fully-defined, the missing formatting options are normally obtained (inherited) from its "base style". Use the Based on style box to choose the base style for this style. If you choose "(None)", the missing formatting options (if any) would be obtained from the built-in default formatting of Atlantis. Note that you cannot specify a base style for the "Normal" style.
The Next paragraph style is a style that Atlantis automatically applies to a new paragraph created when you press Enter at the end of a paragraph. For example, you can choose "Normal" as the next paragraph style for the "Heading 1" style. So when you complete typing a chapter heading formatted with the "Heading 1" style, and press Enter, a regular "body text" paragraph formatted with the "Normal" style would be automatically created. In this way, you could immediately start typing body text of the chapter without having to manually format it with the "Normal" style.
When a hot key is assigned to a style, you can press that hot key in the document window to apply this style to the selected paragraphs. To assign a new hot key to the style, click in the Hot key box, and press the desired keyboard shortcut. To remove a previously assigned hot key, click in the Hot key box, and press Esc.
Click the Font..., Paragraph..., Tabs..., List..., and Borders & Shading... buttons to change the corresponding formatting options of the style.