I never noticed this before.
If I'm in the home page and bring up my Library using CTLR-L and then close the library, Logos4 closes the home page and opens my last used layout.
If I go back to the home page, with the Library closed, and press CTRL-L to open it, the same thing happens.
Is it supposed to work this way? I was quite surprised when it happened to me just now. But then I rarely open the home page, so this could be the way it's always worked.
EDIT: Also just noticed that opening the Library with CTRL-L while on the home page, not only takes one to one's layout, it also puts that layout as the focus, sending the Library (floating widow) behind L4. I don't think it should do that.