Dear Touseef,
We are aware of this issue and will have a fix available in the next release.
For now, you can use the following work-around: open $HOME/.vnl/main.ini and add the following text:
[MainStack]
size=@Size(974 518)
position=@Point(0 0)
maximized=false
Use a Terminal. Assuming "gedit" is installed:
gedit $HOME/.vnl/main.ini