PROBLEM
In ArcGIS Pro, label placement properties for a feature layer are not retained when the layer is published to ArcGIS Online as a hosted feature layer. The images below show label placement in ArcGIS Pro and the web map in ArcGIS Online Map Viewer and Map Viewer Classic.
In ArcGIS Pro:
In ArcGIS Online Map Viewer:
In ArcGIS Online Map Viewer Classic:
This is a limitation in ArcGIS Online. Labels for hosted feature layers are displayed differently because label placement properties in ArcGIS Pro are not compatible with ArcGIS Online.
The following workarounds are possible solutions to this problem.
Configure the labels settings for the hosted feature layer in the ArcGIS Online web map
Configure the labels settings in Map Viewer or Map Viewer Classic to control how the label properties display in the web map. In Map Viewer or Map Viewer Classic, browse to the hosted feature layer in the web map and configure the labels settings. Refer to ArcGIS Online: Configure labels (Map Viewer) or ArcGIS Online: Create labels (Map Viewer Classic) for instructions.
Convert the labels to annotation using the Convert Labels To Annotation tool in ArcGIS Pro
In ArcGIS Pro, convert the feature layer labels to annotation using the Convert Labels To Annotation tool and publish as a tile layer to ArcGIS Online.
The images below show the label placement retained in ArcGIS Online Map Viewer and Map Viewer Classic.
In ArcGIS Online Map Viewer:
In ArcGIS Online Map Viewer Classic:
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