The default behavior of ping command is to send 32 bytes of data to the destination remote computer in an ICMP Echo Request packets. If 32 bytes of data is received on remote computer in an ICMP Echo Request message, it will reply back with an ICMP Echo Reply message containing 32 bytes of data.
For any reason, if you want to change the default behavior of sending 32 bytes of data in its ICMP Echo Request packets, you can -l option with the size of data, as shown below. Here in this example, I had specified to send 64 bytes of data in an ICMP Echo Request packet.
Note that the size range you can specify in Windows 10 is from 0 to 65,500