Hi @Hadigol, Hamid , The difference in the number of security recommendations between the "Recommendations (Preview)" and "Recommendations (classic view)" in Microsoft Defender for Cloud may be due to the fact that the "Preview" version may include new or updated recommendations that are not yet available in the "classic view". You can view the recommendations list here.
It is also possible that the "Preview" version may include recommendations that are specific to certain Azure services or configurations that are not applicable to your environment, which could explain the difference in the number of recommendations.
In general, it is recommended to use the "Preview" version of the security recommendations in Microsoft Defender for Cloud, as it is the latest and most up-to-date version. However, if you are experiencing issues or inconsistencies with the "Preview" version, you can switch to the "classic view" to see if the issue persists.
Please let me know if you have any questions and I can help you further.
If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James