DV Gallery Plugin is Shrinking Images Too Much for Mobile

I am using the DV Gallery plugin and when viewing gallery images on mobile, the quality of the images is reduced way too much. The plugin does not have documentation regarding this issue and the developer does not provide support so I’m stuck with this.

I’m pretty sure it’s something within the plugin “dvgallery.php” file but it’s way out of my understanding even if it might be something simple as changing some values or setting something false instead of true.

What I am looking to achieve is to either keep the shrinking but have more image quality or as an ultimate solution, totally remove shrinking and keep the original images even on mobile.

This is the content of the dvgallery.php file:

[ Code redacted ]

The page I need help with: [log in to see the link]