Hi,
Thank you for your comments, the problem was on my side - a short circuit of SPI pins under one chip.
Finally, the SPI works as specified.

Have a good day,
Lukas

Hello, I would like to ask for your opinion. When I look at datasheet of ESP32 Pico D4, the pins for SPI are: (VSPI) CS - GPIO5, CLK - GPIO18, SPID - 23, SPIQ - GPIO19. But on the Stamp Pico pinout, there are marked as SPI pins: CS - G19, CLK - G18, SPID(MOSI) - G26, SPIQ(MISO) - G36.
When I try to use the SPI in Arduino IDE, I can't get the SPI working. Is there anybody that has some experiences with this?

Thank you very much,
Lukas