The ESP32 they use with a zero as the second digit of the part number has no internal FLASH. The only internal non volatile memory in the ESP32 is ROM. As in “write once at the factory”.
The W25Q128 16 megabyte flash chip on the MicroMod board is the only flash in the system.
It is the flash memory all your user code runs from.
I have no doubt at all that your program that is trying to run from the QSPI FLASH chip would crash if you tried to interfere with the QSPI pins on the CPU.