ok, how do customization in code?

I like this 

Hi,I want to create a sticky header on mobile like this picture.and now is in button style. My store link is https://www.trumerchandise.com/@KetanKumar @bhh @eternalspirit @LJ51 @Jordan42 @Discmayhem @VUMODigital @todd_warnock 

My store Theme is Avatar version 1.2.2.

How can I change the default sort by my store link is https://fashion4less.co.za/collections/all  My store Theme is Avatar version 1.2.2.

our website link is: https://handmade-bedroom-furniture.myshopify.com/and sample link is: https://www.sueno.co.uk/pages/swatches

How to create swatches page or swatches app link to direct swatches page.

How to create a Swatches PagesLike in this link: https://www.sueno.co.uk/pages/swatches

https://handmade-bedroom-furniture.myshopify.com/

I want to add a button on header menu.just like this