On the timeline, whenever I press "PLAY", either by clicking the Play/Pause toggle button, or by hitting the space bar, a pretty big black box pops up over the Render button that says, "Render: For smooth, high quality playback, render your timeline". The box will also pop up if I hover the mouse over the Render button. It will stay up for 3 or 4 seconds, and will not go away by clicking it.
It's irritating. How do I switch it off? Thanks!
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