Microsoft today released a new cumulative update for Windows 10 users running version 1809 "October 2018 Update". The update hits the Release Preview ring. KB4482887 raises the OS version to Build 17763.346.
Unfortunately, I cannot find the official change log for this patch. According to users' observation on the Internet, the update might resolve an issue with the Action Center. There is a known bug that makes the Action Center pane appear on the left side of the screen. The bug has been already fixed in 19H1 builds, so today's update might include the same fix for stable branch users.