CONFIG_64KB_3LEVEL is not available for thedefaultarchitecture x86.
Result is shown for architecture loongarch

64KB with 3 levels

configname: CONFIG_64KB_3LEVEL

Page Table Layout
└─>64KB with 3 levels
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This option selects 64KB page size with 3 level page tables, which
support a maximum of 55 bits of application virtual memory.