Calendar uses small thumbnail instead of full image

By default, My Calendar uses the ‘medium’ image size. If that’s not available, it uses the thumbnail size. You can customize the image size by using filters to pass a custom size.

See https://github.com/joedolson/plugin-extensions/blob/master/my-calendar/mc-custom-image-size.php for an example.

Well, whatever it’s using, it’s taking that image and stretching it out to make it all distorted.

https://newvisionsnetworking.com/calendar/

Click on the event on the 17th and you’ll see what I’m talking about.

That’s coming from the stylesheet, which by default in that theme sets the image to the width of it’s container. You can edit the stylesheet to modify that. Find .mc-main .details img and edit those styles.

Thanks, I found it and set it to auto.

Is there a way to change which size thumbnail it uses?

Yes, you can change the thumbnail size. See my first response, above.