Use D7 as a GPIO output on ESP32C3

I want to use the D7 pin (RX) as a GPIO output. How do I disconnect it from the UART function.

Had to use the GPIO number 20, rather than D7 in the definitions and controls.

Would like to understand why if anyone cares to reply as I find the An/Dn vs GPIOn definition use seems to be somewhat random.

it is random… based on the chip manufacturer and chip version chip pins v/s board pins… but yes very confusing

also has to do with the code, which sometimes abreviates or creates variables or alias which does background conversion