Hi,
There are some rules to be followed for the F-tile. Please check following link: https://www.intel.com/content/www/us/en/docs/programmable/683872/22-3-4-2-0/f-tile-placement-rules.html
There are tools available for you to easily understand channel assignment as per your requirement. See following page: https://www.intel.com/content/www/us/en/docs/programmable/683872/22-3-4-2-0/supported-tools.html
Hope this helps. In case you still need help, please provide us with your design requirement along with the .ip file of the F-tile IP that you used.
Regards