Label Control

ArcGIS Pro's own label expression box is a plain text editor — you write Arcade by hand and find out whether it works by applying it. This tool builds the expression from a row-based interface, previews the rendered result as you go, and lets each segment carry its own formatting.

• The dialog is organised around a list of expression rows. Each row contributes one segment of the finished label, and the rows are joined in order.
• Rows are managed with the buttons beside the list:

• Concatenation mode controls how each row joins to the next: NewLine is how a stacked label — parcel number above area, for example — is built.

• Functions are available per row and cover the usual label needs: DefaultValue is worth noting — it substitutes a fallback where a field is null, which avoids the blank and <Null> labels that plague real data. Use Superscript (sup) for units such as m².

• Formatting can be set globally — Global Font Name, Global Size, Global Style, Global Color — and then overridden on individual rows, so one segment can be bold or coloured while the rest stays plain. For Khmer text, choose a Unicode Khmer font such as Khmer OS or Hanuman.
• Label Class selects which of the layer's label classes the expression is written to, so existing label classes need not be disturbed. Label Position sets the placement.
• The Preview pane renders the label as it will appear, segment formatting included. Check it before applying — it catches null-value and spacing problems that are invisible in the raw expression.
• Labeling applies the expression to the chosen label class and turns labelling on.
• Unlike Show Area and the Display tools, this builder writes a normal label class. The result is saved with the project, prints, and can be edited afterwards in the standard Labeling ribbon.

1. In the Contents pane, select the layer to label.
2. On the KGA Toolbox tab, in the Data Management group, open the Quick Label menu and click Label Control.
3. Confirm Layer and choose the Label Class to write to.
4. Click ＋ Click to add new expression line and pick a field in Source.
5. Add further rows for each segment. Set each row's concatenation mode — use NewLine where the label should stack onto a second line.
6. Apply a function to a row where the raw field value is not what you want — Round for an area, DefaultValue to avoid a blank label, Superscript (sup) for a unit.
7. Set Global Font Name, Global Size, Global Style, and Global Color, then override individual rows as needed.
8. Check the Preview pane. Confirm null values and spacing look right.
9. Click Labeling to apply the expression and switch labelling on.

Requires an active KGA Toolbox license. The tool validates the license before running.