how to switch figwheel build for emacs cider

So, you can not be connected to two build simultaneously.

for instance you have "dev" and "vote" builds,

To make proper switching to another build you should do

(swith-to-build "vote") in figwheel window
:cljs/quit
then
(cljs-repl)

and then open your page in browser, go to your namespace and voila!