In: Config Tools | Peripherals | Peripheral drivers (device specific) | FLEXCAN | Flexcan general configuration | FlexCAN configuration
there is a setting named "Self Reception" (the 14th settings of this block; it's a checkbox).
It should be renamed "Disable Self Reception", since its value determines the value of flexcan_config_t.disableSelfReception in the generate code (in peripherals.c), which in turn determines the setting for FlexCAN's bit MCR[SRXDIS].
The current name suggests the exact opposite of what it does, so it's very confusing.
This is for a project using iMXRT1176.