Materialize Menu Not Working Fully - What should I check?

Hi All,
I have been working on a copy of the Materialize Theme.
I have made a couple of pages and notice that the menu does not work as well as in the Materialize theme original file.
After Export and moving files to the server, the menu toggle button appears fine in mobile view.
However for iPads, Tablets and Desktop the menu does not appear. (It should just pop up and on the left-side once the screen size is large enough.)
I do not see what or where I have changed anything.

What are the first, second and third checks you would investigate to once more have a functioning menu?

TIA
Daniel

Hi Daniel,
Can you share a link to your site so we can see the issue?

Hi Eric,
Of course you can - this link will let you see what is happening.
The page looks fine in smallest sizes, but I have yet to change the content to be block instead of flex.
At least, it needs further attention.
https://www.playrightmusicltd.com/piano … parks.html
You will see the menu working and not working at desktop sizes.

Thanks Eric.

PS For future readers, this link is temporary and will likely be changed as I work on the site.

You have the class="container-grid theme-nav-wrapper" set to display none at the high break points. Reset the display property for it at those and you should be good to go.

Hi Eric,
Thank you kindly!
5 stars for you!
Best wishes,
Daniel