Can the sidebar be customized? I want to insert banner ads there.
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You can modify (read: override) the existing sidebar by adding a snippet file to your existing theme within Shopify.
Your forum pages (powered by Champ) will inject that sidebar if Champ detects the presence of that snippet in your theme file.
Please note -- you do not edit or insert this theme file within Champ itself. Some familiarity with creating/modifying Liquid files is required.
For more information, please read our guide on customization: https://getchamp.net/guides/customizations/