Open mobile dropdowns by clicking the text link
To help make your top-level menu items open easily on mobile, you can try replacing the main link to a hashtag "#". This makes the top-level menu item open the sub-menu options without having to press on the "+" icon on the right. Both the top-level link and the "+" icon will work.
Open your navigation editor:
Change the link for "Shop" to #:
Add the hashtag in the link area (1)
When you add it (2), you'll get a pop-up above. Press the blue bar (3) to accept. Then Apply changes to save.
Use the Apply changes button to complete and then Save your menu changes.
Older navigation system: