When targeting Intel® Cyclone® 10 LP devices in the Intel® Quartus® Prime Software, you will notice that there is 1 pin difference in the total pin count if compared to the Intel® Cyclone® 10 LP Maximum Resources in the Intel® Cyclone® 10 LP Device Overview document.
For example, the Intel® Quartus® Prime Software lists 151 I/O pins for 10CL025YU256I7G, but in other documents it is listed as 150 I/O pins.
This difference is because in the Intel® Quartus® Prime Software, the DCLK is counted as an I/O, since it can be used in user mode but in the respective device pin table, DCLK is not counted as an I/O. Thus, you will find 1 pin difference between what is stated in the Intel Cyclone 10 LP Device Overview document and the Intel Quartus Prime Software.