In the Debutify Shopify theme, you can change the width of the Newsletter pop-up to convert visitors to subscribers and buyers. When deciding on the width, bear in mind how this will look on a desktop screen compared to a mobile phone.
How to Change the Width of the Newsletter Pop-up
STEP 1
Go to your Shopify Admin, and select Online Store.
STEP 2
Select your Debutify Shopify theme, and click on Customize.
STEP 3
Click on the Theme Settings icon.
STEP 4
Click on Newsletter Pop-Up.
STEP 5
Under Pop-Up settings, select the width of the newsletter pop-up.
STEP 6
Click Save to apply the changes.