Can't hide kneeboard in L-alt+F1 view?

[SeaQuark]

When replaying a saved track, and using the L-alt+F1 key to go to the "cockpit hidden" view, I've noticed that my kneeboard is permanently on-screen. The standard kneeboard keys do nothing to change or hide it. I don't remember having this issue before, is it a bug?

 

Looks like this:

 

 

No matter what I do, I can't get rid of it. Tried re-assigning keyboard shortcuts, no dice.