Hi,
Thanks for using Syncfusion products.
There is no way to lose the Shaded Region on the left side. But we can hide the shaded region by changing it's backcolor. Please use the MenuColor class and set the back color of menutext to the MenuLeftStripColor as shown below:
Syncfusion.Windows.Forms.MenuColors.MenuLeftStripColor = Color.White;
Please refer the sample which will explain the above:
http://websamples.syncfusion.com/samples/Tools.Windows/F67039/main.htmPlease let me know if this helps you.
Regards,
S.Rajarajeswari