The ESP32 actually has THREE SPI Channels, of which TWO are available. You can't use the third because that's how it communicates with Program Flash. The attached PINMAP shows how this is done on an ESP32-DEV. You can actually using the esp32-hal-spi.h and .c files call these names HSPI and VSPI. As stated, stay off of the FLASH pins because you could break being able to upload a sketch.
