1.7.4.9.17. 
Key "SeamlessWindowInCompareSide" - Seamless - Component comparison | right-left setting
You can display the component comparison [Part comparison] to the left or right of the seamless window [Seamless].
$CADENAS_USER/seamless.cfg
Value range: left,
  right (default)
[SearchOptions]
SeamlessWindowInCompareSide=left|right