Hey @Theo55 .
Thanks for reaching out.
I do appreciate that you have included a image of the section you are wanting to edit on your online store. I think it’s a great idea to align the header’s main menu with the search and cart button as this can give the store a more professional look. Looking into this change, we will need to make changes to the coding of the theme. As you are using the Supply theme which is supported by Shopify, we can take this as a customization request and use free Design Time for Shopify themes to allow our internal themes team to make the corresponding change on your behalf.
Since we cannot authenticate you over our community forums, we will need you to login to your store through our Contact Us page. This will verify you as the store owner and allow you to speak with a Shopify Advisor to request the alignment on the header section of your store.
Let me if you have any questions or concerns.
Unfortunately, there is no simple solution for this. It would need customization to implement a header like this.
