FastLED, switch off Modul?

how can I switch off a I2C OLED? Just by writing an empty string?

  oled.drawString(64, 15, F(""));

I can switch it on with an connected motion detector. But I am not sure if the OLED is really switched off to save power after a period of time.

And another question: How can I rotate the screen 90°?

Thank you.

How can we tell you anything without knowing the exact display and the library or libraries that you are using?

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