Please add line number column on the search screen result as an option to show it on/off

I'm not sure which search screen you are referring to, or perhaps you are including them all.
The StylePicker window does allow column resizing using the mouse, which allows you hide or show more or less of any column, like this (see before / after):

I can't recall if 2018 support those features.

I meant the style picker screen when user search for result. I ask for the row number before the column 'Style Name'