Tooltip in the red field talks about a 24 bit MRT (like SysTick), but UM11029 says MRT is 31 bit.
And adding channels with "+" shows this, although UM11029 talks about 4 channels:
Hi 12345 67890,
As you mention you only have 4 channels and if you check in the channel number section there's only for options.
Also as you mention, this should be 31 bit counter, I already reported this to the applications team. Thanks for your feedback.
Best Regards,
Alexis Andalon