Create, save and re-apply or import custom symbology (e.g. .lyr in Pro)

[HimanshuMistry]

It would be nice to be able to create, save and re-apply or import custom symbology. For example, the feature available in ArcGIS Pro for importing symbology (.lyr files). This is very useful when creating land-use or zoning maps with standardized legends that needs to be reused in multiple maps that will not only save time but promotes standardize look and feel of those maps.

[HimanshuMistry]

Creating, storing and sharing a symbology that be reused and applied has many advantages. 

• Standardization - same look and feel - required for authorized uses like land-use colors
• Saves time for re-configuring symbology
• Promotion for data visualization best practices

[WingCheung1]

Completely agree. Especially when working with time-series data across multiple layers (e.g. crime data across different time period layers). It is crucial to have identical symbology across the layers to facilitate visual comparison over time.  

[Clubdebambos]

I use the ArcGIS API for Python to save out JSON files for Symbology (Popups, Forms etc). I can then reapply these to any layer I want across multiple WebMaps. When symbology updates in one WebMap, I export the JSON and apply across all WebMaps where required.

I fully support this idea to make the process of creating and applying templates for WebMap layer or Feature Layer components accessible via the GUI in AGOL.