You can preview your site’s responsiveness using the device preview feature in the WordPress Customizer:
- Navigate to Appearance > Customize
- Locate the device icons in the bottom-left corner of your screen
- Click the icons to toggle between different views: desktop, Tablet Landscape, Tablet Portrait or Mobile
You can also use the Hide Controls link to get a full screen view (without the left side panel). This is helpful if your responsive WordPress theme uses a full-page layout.
You can also use the preview feature on the frontend.
1) Click Turn on Builder
2) Use the device icons in the top left corner