Close hamburger menu after link

Hi Pros
I’m (rookie #stage 1)–read a lot about "How to close a hamburger menu after a user clicks on a link). But, seriously, I didn’t find an easy and working way to solve this MAJOR problem. If anyone please could just pop up my site (my first WF site) and give me some support - oohh I would appreciate that! Please ignore the page HOME – but KONTAKT or INDIKATIONEN would show the problem in mobile view.
Many thanks!!! James Moriarty

There we go:
https://preview.webflow.com/preview/marlene-helmle?utm_medium=preview_link&utm_source=designer&utm_content=marlene-helmle&preview=d7b3690fafd8a284d3382d26a799b58b&pageId=5f69f410f47dbf503624de64&mode=preview