Please see screenshot.
I have deleted woodmart-product-placholder photo from file manager but it is still requested.
How do I deactivate this request / change placeholder from woodmart settings for products with no image?
Woocommerce already has a placeholder placed for products with no image.
Our theme doesn’t have any placeholders for products. Probably, you are talking about our lazy loading images placeholder. You can change it from Theme Settings -> Performance -> Lazy loading.
Take into account, if you remove any image used on your website from the file manager you make your website slower because of 404 error requests. You need to remove images from your website via WordPress Dashboard only.