CONFIG_4KB_4LEVEL is not available for the default architecture x86.
Result is shown for architecture loongarch
default or selected kernelversion does not have config value CONFIG_4KB_4LEVEL.
Result is shown for kernelversion 6.0-rc7

4KB with 4 levels

configname: CONFIG_4KB_4LEVEL

Page Table Layout
└─> 4KB with 4 levels

This option selects 4KB page size with 4 level page tables, which
support a maximum of 48 bits of application virtual memory.