Hey harry!

Sorry but you can not change SLIDING OPTION to FLOATING OPTION.but you can do the other way around which means that you can change the option from FLOATING to SLIDING at reporting centre. For more information ,follow the given link :

https://engineering.careers360.com/news/josaa-2015-round-2-what-does-josaa-latest-notification-on-floating-and-sliding-options-mean-119572

Best wishes!