HOW TO
In ArcGIS Pro, once a legend is added to a layout, the appearance of the legend can be adjusted. When a color is added to the legend background, some extra space not filled with the legend item is displayed in the background.
This article describes the workaround to reduce the horizontal background space in the ArcGIS Pro legend by configuring the word-wrapping width.
The image below shows the legend with no extra space in the legend's background.
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