Category and class break symbology reference

Every editable cell on a category or class break row, for point, line, and polygon layers: colour, pattern, marker, size, value, label, and visibility.

Every editable cell on a category or class break row, for point, line, and polygon layers. The rows are in the Style tab, under Customise categories or Customise Class Breaks. Each row sets the symbol for one category or class break, and the legend shows it. For a how-to walkthrough, see How to customise category and class break symbology.

Category and class break symbology is only available when the layer’s colour driver is set to a text field or a numeric field. It’s not available with the no-field option (Single colour or Uniform colour), Colour by zoom, or the Heatmap marker type.

Common controls

These appear above the rows for every geometry.

Customisation collapsible toggle

Reset customisations

The menu’s actions depend on the panel and on which customisations are present:

• Line and polygon category panels: Reset colours and Reset labels. Each asks for confirmation first.
• Point category panel: Reset all labels and Reset all symbology. Each asks for confirmation first. Reset all symbology clears every per-row symbol change at once.
• Class break panels (every geometry): Reset ranges and Reset labels, each followed by the number of customised rows. Each runs at once, with no confirmation. A colour picked in a row’s swatch doesn’t count as a customised colour for this menu. Reset it with Reset to global in the swatch settings or with the row’s reset icon.

Each action appears only when that kind of customisation exists. Each action changes only its own kind. For example, Reset colours doesn’t touch labels, values, visibility, or marker changes.

Legend layout

Which rows a category panel lists

A category panel has one row for each distinct value in the field. You can’t add or remove rows; hide a row instead.

• Up to 50 values get their own row. For numbers, these are the 50 lowest values; for text, the first 50 from A to Z.
• If the field has more values, one Other row covers the rest.
• If some features have no value, a Null row covers them.

Row cells for every geometry

These cells are the same on point, line, and polygon layers. The symbol settings behind the swatch differ by geometry; see the sections below.

Symbol settings — Point

Marker size while zoom sizing is on

When Size markers by is Uniform size and Vary size by zoom level is on, the layer’s zoom stops set the size of every Circle row. The per-row size control is disabled and shows Size varies by zoom level — set on the layer's size control. Each row’s own size is kept and comes back when you turn zoom sizing off. Rows that use an Icon or Custom Icon marker keep their fixed size. See How to vary marker size by zoom level.

Symbol settings — Line

The row swatch shows the row’s colour and pattern with the layer’s line cap and casing. Picking a Line pattern for the whole layer in More line settings sets every category row to that pattern.

Symbol settings — Polygon

Default labels

A class break label starts as the class’s lower bound with an operator: >= on the first row and > on every other row, such as >= 140 and > 2500000. Editing the label marks the row as customised. Reset labels reverts every customised class break label at once.

A category label starts as the value itself, including numeric codes such as 1.5. The number formats set in the layer’s attribute formatting don’t apply to category labels. Editing a label changes the text the legend shows, not the value it matches. Reset labels (line and polygon) or Reset all labels (point) reverts every customised category label, after a confirmation.

What this reference does NOT cover

• Layer controls: the colour driver, Style as, the size driver (Size markers by), colour scheme, classification method, class count, fill colour, marker type, and zoom stops. They are above the rows. See How to style features by category, How to style features by quantity, How to size points by a number, and the per-geometry references in this folder.
• Save behaviour: the Save button at the bottom of the Style tab saves all of these. Raster and WMS layers use Save Style, and they don’t have categories or class breaks. See How layer styling works in MangoMap.
• Reordering class breaks: class break rows follow their values and have no drag handle. Change the method or the class count instead.