There’s normally a “clear space” option in the storage summary widget of the main dashboard page (not sure why its not there for you maybe because you are in a ROBO configuration):

However, it still doesn’t work immediately in my experience. The recycle bin is supposed to auto empty after 24 hours, but is based on the result of Curator full scans verifying and marking the data safe to delete. If you use the clear space option and nothing changes after a day reach out to Nutanix support and they can probably run some manual processes to force it in order to restore your resiliency potentially.

Hello @OsmanDinc 

Please check Recycle Bin Limitations and Considerations:

https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v6_6:wc-vm-recycle-limitations-wc-r.html