How do I make my menus single column

[MonthlyTieClub]

Hi all. 

I know that someone in here will know this.. 

How do I make my drop down menus on desktop appear as a single column, at the moment the number of columns varies depending on page width - first image is how it looks on full screen, 2nd image is how I want to to look on all desktops (I know mobiles have burger menus and that's cool) 

Thanks 

On full screen looks like this 

I want it to look like this all the time 

[KetanKumar]

@MonthlyTieClub 

Sorry for facing this issue, it's my pleasure to help us.

yes, just add simple second submenu iteam that' it

[MonthlyTieClub]

Hi. not sure what you mean 

[KetanKumar]

@MonthlyTieClub 

i mean this articale 

https://help.shopify.com/en/manual/online-store/os/menus-and-links/drop-down-menus

[MonthlyTieClub]

I've got the menu setup, 

but it defaults to multi columns 

I'm looking to make it stay 1 colomn, I have a feeling this is a CSS issue. 

[KetanKumar]

@MonthlyTieClub 

if possible to add on staff account?