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1. Shop page: Navigate to Theme Settings > Shop > Sidebar & Page title and make sure you have activated title http://prntscr.com/jqk2wm Next, enter shop page editing mode and set the image or color on title http://prntscr.com/jqk3we
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Attached screen shots of the steps that you mentioned and still the page header is not working .. as in the screen shot as well .. could you let me know what else should be done?