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I've moved your post from the Photoshop forum to the Sketch forum where you are more likely to get a response to your question
Sorry. On phones, the mobile apps only support portrait mode. So even if the device itself is positioned in landscape mode documents are always in portrait orientation.
It was a decision that was made early on with the apps and I don't believe there is a plan to change that, but I'll share your comments with the drawing teams.
I have a new Galaxy Note 8 with great pen possibilities for sketching & assumed Adobe Sketch was the idea tooll, but after days of thinking I was just missing how to select landscape mode on it's big screen it is surprising to see here that is not supported? I hope Adobe will address - love their suite generally.