Hello @Shawkath_Khan, welcome to the QuickSight community!
It seems like the functionality for this is still available but the identifier was changed. After looking through the documentation, it seems like this is what you want to use:
The singleSheet property can be used to enable or disable sheet tab controls in dashboard embedding.
Search this documentation page for sheetOptions and you will see the singleSheet identifier I am mentioning. If you turn this to true, then the tabs on the sheet should be removed. Let me know if that helps!