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Thanks Daniel, that was the reason 🙂

Ahhh, got it sorted.

The theme I’m creating was based on underscores theme, its css included the following:

@media screen and (max-width: 600px) {
	.menu-toggle,
	.main-navigation.toggled .nav-menu {
		display: block;
	}

	.main-navigation ul {
		display: none;
	}
}

I’m guessing you use the same class names?

Anyway I’ve deleted the above and it all works fine now, sorry to waste your time.

Thanks for your response Peter.

I’ve tried setting the break point to 321px but I still get the responsive menu in landcape mode?

Sorry, the forum has removed the tabbing I’d put into the structure to make it easier to understand, I hope it’s still clear enough.