Change all Via size

I am using xPCB Layout Xpediton Enterprise X-ENTP VX.2

I have a PCB design already routed but have been requested to change my Via size from 8mil to 12mil.

I assume there is a setting that will allow me to change all of the placed vias at once.

Here are the steps I have already done/tried.

Changed the via in the Setup>Setup Parameters>Via Definitions to the new Via size (12mil).

and then ECO>Update Cells & Padstacks.

But my old via size is still on the board.

Any help would be appreciated as there are nearly 300 via's to be updated and I would rather not do this one at a time.

Thanks in advance,

Jacque