CONFIG_64KB_3LEVEL is not available for the default architecture x86.
Result is shown for architecture loongarch
default or selected kernelversion does not have config value CONFIG_64KB_3LEVEL.
Result is shown for kernelversion 6.0-rc7

64KB with 3 levels

configname: CONFIG_64KB_3LEVEL

Page Table Layout
└─> 64KB with 3 levels

This option selects 64KB page size with 3 level page tables, which
support a maximum of 55 bits of application virtual memory.