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I couldn't dock the document selector tab as it would be by default.

I double clicked on the header but didn't work.

Please help.

Not sure what you are trying to do.

If the document selector is not docked to any border then
left click on the top border of the document selector
with the left button still clicked, move the document selector around the screen
you should see some graphics appear on the screen (top,bottom,left,right)
move the document selector over the graphic on the border side you want to dock to then release.

thanks for your reply.

I already tried that but it is not docking on any border.

I had the same problem with the document selector. By double clicking on the title bar of the document selector you will toggle between docked and undocked.