Hello,

In the last round of JOSAA there is no option of  " Slide or Float". In last round the only option is to " Freeze". And If you don't select freeze then your allocated seat will be cancelled it will not be auto freeze.

To know more about JEE Advanced Counselling visit the link below:

https://engineering.careers360.com/articles/jee-advanced-counselling-and-seat-allotment

I hope this answer helps. All the very best for your future endeavors!