Compatibility of header menu and side menu

[Yuta_M]

Hello.

I am thinking of migrating from Wordpress to Shopify.
I'm currently using Wordpress (dond.jp), which has a header menu and a side menu that users are used to.

The Shopify (https://e1print.dond.jp/) "debut" theme I'm using now has only a header menu.
If I add an app and implement a side menu, the header menu disappears and I can't find a way to keep both.

I'm also planning to rebuild it with the "Dawn" theme for the future.
Do you have any good ideas?

[suyash1]

@Yuta_M- can you please add app for side menu, then we can check on browser