So many think merely rotating the art (or switching to another art program) is the answer for this issue. It's the wrong answer for anything but the simplest art. With dozens of layers, high-res placed rasters, thousands of objects... rotating complex art, merely for a better view (to perhaps proofread upside down type) is dangerous to your project surviving 100% intact. The procedure is onerous: 1) Unlock all locked layers. 2) Unhide all hidden layers. 3) Unlock all objects on all layers. 4) Worrying about, and possibly temporarily changing, your artboard size, or its rotation. Based on how you exactly select everything, you hope masking fills, groups, pattern fills, photo fills, rotate correctly, on screen. Large-area projects can rotate off of the maximum area permitted by Adobe (signage etc.) Objects can easily fly off-artboard (as well as off-screen and out of mind). Then when you are done looking at your art from the new angle, you have to reverse the above process to get back to where you started. (If you made any simple editing change, you can't undo or revert to get back to where you started.) Switching between Portrait and Landscape artboards is irrelevant, art doesn't move at all, just potentially puts static objects off-artboard. Switching software is not a possibility. My typical random clients expect Adobe files. I would be never used again if I somehow sent material from non-Adobe. (No one would understand why I even would do such a thing.) CC is the one thing random artists who will never meet or talk, have in common working for nationwide companies. I have no time to translate and hoping for accuracy between programs and versions. I wouldn't give non-Adobe files to other artists via a middle-man client, nor would ever want to receive non-Adobe art (when I do, such a nightmare and waste of time getting it in to CC intact, especially projects that have linked file collections in the gigabytes). This is a horrible procedure under rapid deadlines, where perfection is expected. I hope Adobe adds this. Too important not to. But we've been waiting literally decades. Another stopgap measure is to save your art as pdf, for the sake of rotating/viewing in Acrobat. But that's no fun for large complex art either.
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