[OH3] Main UI Examples

The only way to do this is to create a custom widget under Developer Tools. Then you need to apply that custom widget to each Item as Item Metadata. Later, if you change the custom widget it will apply the changes to all of the Items that use that widget.

In your case you need to change the default list widget. See Example Custom List Widgets for further discussion and OH 3 Tips and Tricks and some ways you could apply the metadata to the Items through the REST API more efficiently than through clicking through the UI. Though, once you’ve created your custom widget, it’s usually just a couple clicks to apply it to an Item.