This members-only tutorial provides the steps to implement Combination Filters using Isotope for Ultimate Block's content filter in Oxygen.
Note: The Ultimate Block reference site uses AND logic i.e., multiple filters can be selected per row.
With the Isotope implementation in this tutorial, only 1 filter can be selected for each row at any given time.
For multi-filters per row, you will have to modify this tutorial based on https://codepen.io/desandro/pen/btFfG.
Install and activate My Custom Functionality plugin.
Connect to your hosting account using a FTP client and navigate to site's /wp-content/plugins/my-custom-functionality-master.
Upload isotope.pkgd.min.js to the plugin's assets/js directory.
Create a file named say, isotope-init.js in the same location having: