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Hey there 👋
Thanks for reaching out!
It looks like you’re using the Astra theme and need some help with the thumbnail sizes, correct?
Kindly note that support related to third-party themes is our scope of support. You’d need to reach out to the Astra theme developers for further help with this, as they may have specifications for their images sizes.
Here is a direct link to their support forum:
In the meantime, I came across this Astra support article which may help you get started in the right direction:
Hope this helps!