Customizer, as the name suggests is used to customize your website’s appearance. You can use it to modify your website’s appearance settings.
To access customizer you have two options:
Option 1: From any page or post on your website.
i. Go to action bar in the bottom-right corner of the screen.
ii. Then, Click the three dots.
iii. Then select Customize.
Option 2: From dashboard
i. Go to My Sites.
ii. Select Themes.
iii. Then select Customize under Personalize section
Facilities provided by customizer:
1. You can preview what your website content would look like in a different theme.
2. By clicking on Change, you’ll see a selection of themes to preview.
3. By clicking on Save & Next you can keep that theme.
4. You can also preview your design and see if it works well across all screen sizes – desktop, tablet, and smartphone.
Themes in customizer generally customize content like: Site Identity, Header Image, Menus, Widgets ,Static Front Page ,Featured Content .