CAN FD issue

In FD mode cansend can1 123##1abcd
what is the purpose of 1(that flag)? And please give some document on that for different flag values.

Please help me on this. I learned in many websites but not able to get it.

It seems just the enabled bit for FD (Flexible Data-Rate).
Could you help to refer the following instruction to configure different data rate and bit rate for CAN?
Controller Area Network (CAN) — Jetson Linux Developer Guide documentation (

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