PROBLEM
In ArcGIS Pro, the Extent Indicator button in the Map Frames group on the top ribbon is disabled when attempting to add the extent indicator to the page layout.
The following image shows the disabled Extent Indicator button.
Choose one of the options below depending on the cause to resolve the issue.
Add map frames to the page layout
In ArcGIS Pro, add at least two 2D map frames to the page layout. Refer to How To: Set up a page layout with multiple map frames that reference the same data for steps to do so.
Create a new page layout
In ArcGIS Pro, create a new layout, and add the map frames to enable the Extent Indicator button.
The following image shows the Extent Indicator button enabled in ArcGIS Pro.
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