Are you looking to add a new panel in the block editor sidebar as shown in the screenshot below? The old style meta box with add_meta_box works fine in the block editor as well. However, since it’s a typical metabox,
Are you looking to add a new panel in the block editor sidebar as shown in the screenshot below? The old style meta box with add_meta_box works fine in the block editor as well. However, since it’s a typical metabox,