I want change to the normal appareance of My LibreCAD but I cann't

Hi for everybody sometime ago I tried change the appareance of my LibreCAD that is the reason the interface is black color so I want change to white color because I cannot see and select correctly the tool for drawing, also I reinstall the LibreCAD many times and I get the same results. finally I tried  check in the program the options.
options>application preferences
options>current drawing preferences
for change color but I don't have good results.

This is my LibreCAD version:

Version: 2.2.0-alpha
Compiler: GNU GCC 4.8.4
Compiled on: Jan 11 2017
Qt Version: 5.2.1
Boost Version: 1.54.0

Try the different styles in Options -> Widget Options

For further customization you can learn about Style Sheets.
http://wiki.librecad.org/index.php/User_Interface

For the background color in the drawing area it is:
Application Preferences -> Graphic Colors -> Background

For style sheets you would edit the color for QToolBar and QToolButton,
if you are using toolbars.

The dark color is probably because of your desktop theme,
and would change with the theme.