Collection Section

From your Shopify admin, go to Online Store -> Themes.
Find the theme that you want to edit, and then click Customize.
Choose Collection from the dropdown window.

Collection Header

In Collection Header, you can set up for Collection Image and Collection Description

Upload one image for all collections: You can upload it right in theme editor. Please choose Collection Image as below:

2. Upload different image for different collection: Please skip Step 01 above, don't upload an image in theme editor of Collection Image. Go to Collection Admin -> Upload an image at here:

Setting	Description
Background Color	Set the background color for the section.
Background Gradient	Set the background gradient for the section.
Section Width	Select the width layout of the section to be either default to the body's width, 1170px, 1770px or full screen width.
Spacing top - Desktop / Tablet / Mobile	Determine the spacing of the section from the top on Desktop, Tablet and Mobile.
Spacing bottom - Desktop / Tablet / Mobile	Determine the spacing of the section from the bottom on Desktop, Tablet and Mobile.

Setting

Description

Background Color

Set the background color for the section.

Background Gradient

Set the background gradient for the section.

Section Width

Select the width layout of the section to be either default to the body's width, 1170px, 1770px or full screen width.

Spacing top - Desktop / Tablet / Mobile

Determine the spacing of the section from the top on Desktop, Tablet and Mobile.

Spacing bottom - Desktop / Tablet / Mobile

Determine the spacing of the section from the bottom on Desktop, Tablet and Mobile.