No, in "normal" size it will only show the the bytes from the beginning or 'til the end but never the full coding. Maximizing goes to full width as before, but leaves plenty of empty/unused space.
FWIW, do you have the ability to test in virtual machines? You could just set one up with (or change to) a 4k screen resolution and I believe that would help you debugging this directly.
Unrelated: I have pointed this out before, I am not a fan of a horizontal view at all - this applies to both LCode v1 & v2. The actual coding value has little importance except to pro-users (and ever there it is limited). That said, I would even go away from the per-byte display in general and instead work with a grid based vertical approach for all documented options. this would also help with empty bytes and make available options directly viewable. Yes, having an advanced/expert view with a byte/bit wise editing is helpful to experts though for regular users it really makes things harder than easier. The longer these codings get (or when you look at parameterizations) this whole per-byte concept is beyond it's limitations. Don't get me wrong, I very much appreciate the work you have put into this - though from a UI/UX point of view v2 is a step in the wrong direction.