For the first part there is no margin as you see

And For Text in the guide hey say i need to change

5- Fonts , colors & System Metrics > Fonts & System Metrics > Windowtext:color

This text changes in both areas when selected, the locations for selected are here-

ItemsView(Main Window)-Explorer & Shell > Explorer > ItemsView > ItemsView > TextColor : Color
TreeView (Left Panel)-Explorer & Shell > Explorer > Treeview > Treeitem > hot , selected etc > Textcolor : Color

and i change it in this 3 locations and nothing change

thanx