Right-clicking on the notification area icon Jwno Logo will bring up a menu with several commands:

Item Description
Jwno <version> Shows the versions of Janet and Jwno itself.
Launch REPL Opens the REPL window.
Update Monitor Layout Normally Jwno will adjust to monitor layout changes automatically, but you can use this command to do that manually. It will also retile all managed windows.
Reset Keyboard Hooks Sometimes Jwno's keyboard hooks (which are needed for global key bindings to work) may get overridden by other programs, and this command is to fix that.
Exit Tells Jwno to quit.