As simple as this may seem, it has been very handy for me in several occasions, and hopefully it will be for you as well. Sometimes when you have so many layers of text and shapes, the transform boxes just take over the whole preview screen which will impair your vision to the final result.
The idea is to hold CTRL + SHIFT + H and the transform boxes go. If you want to turn it back on (which you should) you hold the shortcut keys (CTRL+SHIFT+H) again.
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