Or just delete all the other SaiaNet sites if you only plan on monitoring West Seneca PD on the Seneca One site. You can also create a quick key for each site to toggle them on/off as you please. Plenty of ways to go about it, the SITE HOLD is a bit of a clunky solution to be honest.
I would suggest reading the Easier to Read guide for the SDS series, it explains a lot of the features.