1. Make sure the module Theme Tweaker is installed and enabled at your store. If not, install and activate it.
  2. Click Look & Feel in the main menu to go to the Layout section and select the Custom CSS tab there.
  3. Enable the Use custom css option.

  4. Insert the following CSS code into the field below:

    .powered-by .powered-by-label {
        display: none;
    }
    
  5. Click Save.

  6. Check the results in the front end.

  7. If you need to remove the “Powered by” notice on the Mobile Mode, just go to Mobile custom CSS section, enable Use mobile custom css check-box, add the below code to the corresponding field,and click Save:

    p.powered-by-label {
        display: none;
    }