Why isn't the mobile menu functioning in the Minimal Theme?

I’m using the Minimal Theme on my Shopify site. However, I noticed recently that the menu in the mobile view stopped working. I need to fix it somehow. If I click the menu in mobile mode, nothing happens.

I recently removed the Bold Marketplace app from my store. Not sure if that caused it.

Does anyone have suggestions on how to fix this in my current theme installation?

My site is www.dialup.co.uk

Hi there - your website is password protected, please share its password so I or other community members can assist you.