Reply To: Replacing menu button on mobile with always-expanded items

[Beverleyh]

I can’t see much on mobile, but the menu markup changes from this;

id="menu-menu-1" class="nav-menu"

To this;

id="menu-menu-1" class="nav-menu toggled-on"

When the menu button is activated.

I would presume that there are styles defined against this toggled-on class in one of your stylesheets that you can transfer to the non-activated state to keep the menu permanently open.
You can use the developer toolbar to see what/where those are – that’s F12 in most browsers.