You will find the following setting options on the Color search [Color Search] tab page:
Number of colors which are selected by default
You can see the result under Search dialog page -> Search tab page - > Colour [Color] tab page.
Four colors have been selected according to the default settings. You can adjust the default for each search in the "Color search [Color Search] " dialog if required. Or you can select the "Use entire image for search [Use whole image for search] " option.
Number of entries in [Number of entries in search history] the search history: