What is customizer?
Customizer gives you option to edit Shop pages and Product Pages for your selected theme. You can makes changes like selecting font family, choosing font size, selecting font colors, text colors and apply changes to your shop pages and product pages.
How to use Customizer?
Select Themes menu from left side of your admin screen. Now you can see all your used themes and which theme is activated.
In above screenshot you will see your theme image on left side and on right side you will see options to choose.
First option you will see edit homepage where you can edit your home page. Read this blog Tutorial for theme customization
Second option says Customizer where you can edit your apply changes to your shop page and product page.
Select pages on which you want to apply changes. Shop pages will open all shop pages and you can choose which shopage you want to use. Product pages will open all product pages which you want to use.
On clicking “Theme Settings” you will option like Colors and Typography. Colors will give you option to apply color to your respective pages. Typography will give option to make font changes like font family and font sizes.
Click on “Colors” will give you option for aplying color changes.
Click “Ok” to see demo o right side. If you want save all changes Click on “Save” button which top right corner of screen and your chnages will be saved.
Go back by click back arrow on the left side of your color heading to make changes for fonts by Clicking Typography. You will see all font families.
Click “Change” You will see fonts families. Click on font families and chose font weights according to your choice.
Click on “Save” button which is on top right corner of screen for saving these changes.