Deleting layout object, part, or background styles
You can delete custom styles from database files. If you delete a custom style that is applied to objects on a layout, the objects revert to the default style for that object. You can’t delete the default styles that come with FileMaker Pro.
To delete an object, layout part, or background style:
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In Layout mode, click Inspector Inspector button in the layout bar, then do one of the following:
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Click the Styles tab, and select Show All. Pause the arrow pointer over the style you want to delete, click Style button, and choose Delete Style.
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Select an object that has the style you want to delete, and click the Appearance tab in the Inspector. For Style, click Style button and choose Delete Style.
Related topics 
Editing layout object, part, or background styles
Creating new layout object, part, or background styles
Renaming layout object, part, or background styles
Copying formatting attributes between layout objects, parts, or backgrounds