Microsoft has provided a design mode to make it easy to apply column formatting to SharePoint (SPO) list and document libraries with no code. The change means that it is no longer necessary to deal with JSON code when basic formatting is needed:
To access the Design mode for a list / document library column, just clic on Column settings –> Format this colummn so the Column formatting panel is shown:
In the Column formatting panel click on Switch to design mode:
Once you are in Design mode, you can choose between applying the default template or Edit the template and choose the background colors to be used in the column.
For more information about SharePoint Online and OneDrive For Business, see Chapter 8 in Office 365 for IT Pros
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Love these changes but wish the formatting extended to the Web Part views of the same list(s).