default or selected kernelversion does not have config value CONFIG_ADV7393_2XMEM.
Result is shown for kernelversion 6.7-rc3

Double

configname: CONFIG_ADV7393_2XMEM

Size of ADV7393 frame buffer memory Single/Double Size
└─>Double
In linux kernel since version 2.6.38 (release Date: 2011-03-14)