CONFIG_MIPS_INSANE_LARGE is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT or mips
default or selected kernelversion does not have config value CONFIG_MIPS_INSANE_LARGE.
Result is shown for kernelversion 6.2.5

Support for large 64-bit configurations

configname: CONFIG_MIPS_INSANE_LARGE

Linux Kernel Configuration
└─>Kernel type
└─>Support for large 64-bit configurations
In linux kernel since version 2.6.12  
MIPS R10000 does support a 44 bit / 16TB address space as opposed to
previous 64-bit processors which only supported 40 bit / 1TB. If you
need processes of more than 1TB virtual address space, say Y here.
This will result in additional memory usage, so it is not
recommended for normal users.