The Change User Library option will allow you switch JMagic to a different MarkMagic User Library than the one you originally started in.  During JMagic startup, you are asked which User Library you would like start in.  Information about that can be found on the Logon Preferences help page.  Rather than closing JMagic entirely and then choosing a different User LIbrary upon startup, you can simply switch to different library using the Change User Library menu option.  Note the Change User Library option is grayed out if you have a format open in JMagic.


If you are unsure of which User Library you are in, remember that the current User Library is always displayed at the very bottom left of the JMagic window.  In the below example, JMagic is currently started in User Library MRKMAGDTA.