PROBLEM
In ArcGIS Pro, the horizontal alignment controls how multiline text is aligned. In some instances, the horizontal alignment option is unavailable and it is not possible to modify the text alignments in the callouts.
The image below shows the callouts on a map with left-aligned text.
The unavailable horizontal alignment option is for text symbols. The callouts are stacked labels, and the horizontal alignment can be modified under the Stack section in the labeling properties settings.
Use the workflow below to modify the alignment of the callouts.
The image below shows the callouts with center-aligned texts.
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