Fixed component looks bad in Docs page

[astraychildmarion]

good day !

Environment Info

 "vue": "^2.6.11"
"@storybook/addon-actions": "^6.3.2",
"@storybook/addon-essentials": "^6.3.2",
"@storybook/addon-links": "^6.3.2",
"@storybook/addons": "^6.3.6",
 "@storybook/theming": "^6.3.6",
"@storybook/vue": "^6.3.2",
"ant-design-vue": "^1.7.6",

Problem

My problem is the same as the link below: fixed header and sider look great in Canvas, but they also fixed in Docs page.
I read issue 8011 and try rewrite stories.js in mdx..., however the resolution is for React.js only ?
How to make it work in Vue.js ?
#8011 (comment)