I don't understand the error re this format rule?

The format rule ‘Event’ is not applied to any column. Select at least one column in the settings for the format rule to display.

I have looked everywhere I can think of and I can’t find the format rules mentioned.

Everything did seem to be working ok, but then this error popped up.

I have another error

Map control Map uses invalid map column ‘none’ and no valid mappable column could be found

But when I go to the map view section, it is prefilled with NONE and won’t let me edit it.

Format Rules: The Essentials - AppSheet Help explains where to configure format rules, which depends on which version of the app editor you’re using.

Configure the table columns with mappable data to use a mappable data type.

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