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Poor screen utilization in landscape on tablet
(lemmy.world)
As seen in the screenshot, there's a lot of wasted space in landscape mode on my tablet. I don't see this issue in the feed. I've only noticed it when viewing it editing posts and comments.
You could also argue UI elements close to the edge of the screen are a bad idea holding your Tablet in landscape since you could fat finger on them.
So give the users a choice to full-screen that view or not.