I would like to add a thousands separator to a number label on ArcGis online. Please advise if you can. Thank you.
This isn't possible with labeling functionality at this point in time. You can add thousand separators to number fields in the pop ups.
If this is something that you would like to see implemented in the future, please submit this idea on the ideas site: Esri Arcgis Ideas | Ideas Submission Portal
Is there a place to format significant figures?
Example: format $2.63000000 to $2.63