I’m running into two problems, the first is that my website can’t search for any products, the second is that I follow the instructions in the documentation: Go to Dashboard -> Products and click on the “Star” icon for particular products .It does not work, when I add product related components on the page and select Featured products, no products are displayed.
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and let me know I will check and give you a possible solution. Also switch the child to parent theme.