In fact, you just have to choose the right format:
ISO A3 for portrait, and ISO A3 Elongated for landscape!
Edit: in fact there is the portrait and the landscape for the ISO A3 or the ISO A3 Elongated, I don't know what the difference is, because the dimensions are the same.
Isn't there a small entity hidden in the bottom right corner?
When you zoom everything, what display do you get?
Is there a way to select what we want to keep, and remove entities outside the selection? That way I select my outline, and I delete all the outside and I'm certain that I only have my outlining in the layout.
Is there a way to select what we want to keep, and remove entities outside the selection?
not to my knowledge (but I only use it basicly)
On the other hand, you can do a relatively large "zoom out" and make large selection squares outside your plane. It should make a distant entity appear, or at least select it (if it exists) and you can delete it.
You have to select the entities you want to keep, then by holding the SHIT key (or SHIFT) make a rectangle encompassing all the entities in the drawing.