placeholder image for the slider

I have an issue with my mobile LCP and it seems to be with the themes slider placeholder (see attached image) .
This green background image is from the themes demo “furniture-2” can you tell me where the settings are to remove it and why is it needed?
Please see below message from WP Rocket:
“The Optimize critical images feature does seem to be working, but it looks like it’s picking up on the placeholder image for the slider — this suggests that the “real” slider images may be taking too long to load when the OCI’s lcp-beacon.js script is running, so it ends up detecting the placeholder as the LCP image by mistake.“

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Hello,

This approximates when the main content of the page is visible to users, thus the site needs to be optimized in general so that the largest content element is displayed more quickly.
https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/?utm_source=lighthouse&utm_medium=lr

If we check your site via Insights, we can see other issues: which together can cause this problem. So I suggest you sort out these diagnostic issues ( and then re-check whether the “Largest contentful…” issue persists or not.

https://prnt.sc/Z9pKWcG1L0nE

Kind Regards

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