Signal-Desktop launches oddly in this o/s. On most other operating systems, when Signal is launched with the --start-in-tray --use-tray-icon command line options, the application launches minimized. With Manjaro, however, the application launches in a regular window. It is in the tray, but it’s weird to launch in an open window.
Obviously this is a very low-priority issue; but seems like a bug, when the behavior is noticeably different from other Linux’s & Windows.