Thank you - see below
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Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.
Hi @Joegr7 ,
According to Shopify’s guide, the recommended image size is 1200px to 2000px width, and 400px to 600px height, and the width-to-height ratio for your images is 2:1, to avoid image cropping in your slideshow. You can find the guide here: https://help.shopify.com/en/manual/online-store/themes/os/themes-by-shopify/debut/sections#image-size-recommendations. Also check out the answer from the Shopify Team in a similar topic here: https://community.shopify.com/c/Shopify-Design/Debut-Theme-Slideshow-Perfect-Banner-Sizing/td-p/310444
Hope this information is helpful for you. Good luck with your store!
Opinew Team.
@KetanKumar Hi Keta, this is my URL www.thegiftcompany.com.au
Thanks,