Post Slider plugin does not have the option to "contain" so product image is getting cropped in Carousel

I am using the "Post Slider" plugin in the home page to show a list of products. The product images are all different dimensions.
In the settings of the plugin there is no option to allow the image to be "contain"ed without loosing its ratio, like it does in the "Categories" plugin.
Am I missing something?

Thank you in advance!

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