I added a server that I needed to monitor for a couple hours. When I was done, I swapped out the license and attempted to pause the monitoring to remove the blue banner at the top:

You have unlicensed servers. Unlicensed servers will not be monitored and will not raise alerts.

However, I was unable to pause the monitoring as it just refreshed the page, with the blue bar at the top, and the "pause monitoring" button still enabled and "resume monitoring" button still disabled. Ideally, there would be a way to say I don't want to monitor this server so don't show me the large warning at the top. The only way I can remove it is delete the server all together and loose all the data I wanted to keep for a couple weeks.