Restore OF windows on launch

In the past, OmniFocus used to restore all my windows on launch.
For some times now, it doesn’t anymore.

I like to work with two full screen windows, one with Projects perspective, one with Due Dates Perspective. When I quit OmniFocus (and it’s quite often because of regular automatic updates), it just opens a small window that is not full screen, nothing more.

I can’t find why it happens this way.

Has anybody a clue about that ?

Thanks a lot,