Menu button not working in tablet form

Design help General
1

Hi,
If I view in the tablet form, when I click on the menu button, my navigation link disappear which I cant understand why. Could anyone assist me, thank you!

This is the link
https://preview.webflow.com/preview/knowallsides?utm_medium=preview_link&utm_source=designer&utm_content=knowallsides&preview=2d152e61606dc4c0a75a9ece4fba7009&mode=preview

Here is my site Read-Only: LINK
(how to share your site Read-Only link)