OpenCart 3 Filter Shop - change checkboxes to dropdown

Change Filters Options Checkbox Virtualization to Dropdown.
Extension is Response Mobile.
Includes Code File filter showing how to use.

Compatibility :
3.0.0.0, 3.0.1.1, 3.0.1.2, 3.0.2.0, 3.0.3.0, 3.0.3.1, 3.0.3.2

Click Here : Filters Checkbox to Dropdown