Item Bucket Settings in Sitecore SXA

Do you know when the SXA module is installed, the Item Bucket Settings from /sitecore/system/Settings/Buckets/Item Buckets Settings are not considered

This is because SXA has its own provider for buckets. You can find this defined in /App_Config/Modules/SXA/Foundation/Sitecore.XA.Foundation.Multisite.config:

<setting name="BucketConfiguration.DynamicBucketFolderPath" value="Sitecore.XA.Foundation.Multisite.Buckets.SiteBucketPathProvider, Sitecore.XA.Foundation.Multisite" patch:source="Sitecore.XA.Foundation.Multisite.config"/>