To clear/delete the dummy testimonials for Layout 1 follow the process mentioned below.
Step 1: Login to Zepo Dashboard
Step 2: Go to Content > Site Elements.
Step 3: Click on Testimonials Box under the heading 3rd Party Widgets.
Step 4: Delete (You can update testimonials with yours) all the content in the boxes.
Step 5: Scroll to bottom of the page and click update to save the settings.