Remove them manually in Conft mode use "no flow" commands, use the wizard to create new flows and ticking the box, delete old-flows.

Alternatively (probably what you want), enter FabricManager.

Select fabric tree, go to the Flow_Statistics tree entry (on the switches tree at bottom).

On the right the flows will show up and delete wanted flows by selecting them and clicking the small (red-arrow) remove icon.

Goodluck,

Peter.