Dock project explorer and Properteis window to default position

Hello,

I accidentally undocked the Project Explorer and the Properties window and I am now unable to dock them back to the original position.

Now when I dock it, instead of docking it to the left most column, it docks itself horizontally across the top of the screen and the properties window too docks horizontally across the top of the screen.

How do I get the docking position to the default settings. Please advise.

I can send screen dumps to illustrate the problem more articulately, if needed.

Regards

Ajay