The order in which sub themes appear in the Sub Theme Manager Pane of the Layer Theme Editor is extremely important as it determines the order in which they are applied to the Geoplan.
The base or default theme is applied first and later themes may override earlier themes if they are applied to the same properties, over the same zoom/scale range. Properties are the object type-specific attributes (such as symbol, symbol colour, line style, line width, etc) available to pick from in the Properties section of the Sub Theme Editor Pane. The details of the selected properties are shown in the Ranged Themes grid of the Layer Theme Editor.
The toolbar Move Up (
) and Move Down ( 
) buttons of the Sub Theme Manager Pane should be used to respectively promote or denote Sub Themes.
Disabled themes are themes that are not displayed on the GeoPlan Window. Such themes are not subject to theme precedence as they are hidden. To enable a hidden theme, select it in the Sub Theme Manager Pane and click the Enable/Disable button (
) on the toolbar. Once enabled, a theme will follow the theme precedence rules described above.
All themes have zoom levels. This means that different themes can be set up for the same layer but that they may be applied at different zoom/scale levels.
Zoom or scale levels are available to configure in the Visible Range section of the Layer Theme Editor.