link working but image is not zooming

Hello!

I am using theme Freesia photography website for my own photography website. I wanted to create custom URL for my images when clicked so I contacted their team and they told me to use your plugin. After using your plugin I am able to create custom links for my images but now I am facing the following issue.

1. If I click the image it opens in new tab and with the same (small) size which is by default on the front (home) page. So how can I enlarge/zoom the image on click but keeping it on the same page rather it being opening in new tab? as it happens on their images in creative gallery demo here: https://demo.themefreesia.com/photograph/