SPI clock frequency switching

[focussing]

Hello!

Our board consists of a 480x320 TFT / RP2040 combination.
The TFT SPI clock rate in my situation is 24MHz (via User_Setup.h) but I use an ADC running on max 1MHz so I use SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE0)) every time I do an AD-conversion.
That works fine but after the ADC cycle, I refresh the TFT window and see that the TFT SPI clock rate has become 8MHz.
How can I get that back to 24MHz?

I hope you can help.

Best regards,
Raymond