Linking multiple collection under Submenu (Debut Theme)

Store Design
1

Hi,

I want to link multiple collections under the sub-menu ( so that pressing the submenu will display all the products of all collections that follows the sub-menu)
Also, I want the dropdown of the menu to be transparent not a solid-colored box.
Visit my store for reference, petgocrazy.com.
In my store, under the sub-menu (Our Products) I made a collection of all the products so it shows all the product (though there are several collections following the sub-menu)
I hope you got my concern, hoping to be responded with a solid solution.

Thanking you all in advance.

2

Hi there,

I was wondering about the solution but have not received the solution yet.
Isn’t the issue worth solving or it’s a repetitive issue, if so then please pass me the older link so that I can get some ideas, or else I will be looking forward to the solution?