What action should a developer take to allow styling differences for single-brand stores in the store locator?

Adding a Boolean custom attribute to the Store system object is the correct choice for enabling styling differences for single-brand stores in the store locator. This approach allows developers to implement simple, conditional logic that can dynamically alter the store's presentation based on the value of the custom attribute.

By using a Boolean attribute, you can easily determine whether a specific store is a single-brand store or not. This flexibility allows for a streamlined way to apply different styles or branding elements directly from the store configuration. Developers can then reference this attribute in their templates or components to conditionally render styles or layouts that are specific to single-brand stores, thereby maintaining a consistent look and feel throughout the store locator feature.

The other options do not provide the same level of immediacy or control over the styling variations. Creating a new custom object configuration might require extensive additional setup and data management, which is not necessary if you can achieve your goal with a simple attribute. Adjusting site preferences in the Stores group may not offer the same level of granularity or may apply changes across multiple stores instead of targeting only the single-brand stores. Configuring the existing Store custom object type definition tends to involve more complex changes that could impact the overall structure, whereas adding a Boolean attribute is more straightforward and easier