Before you close
PowerPoint make sure you have saved your work, if you have not
saved your work before closing PowerPoint it should ask you whether you want to
save the changes you have made to your presentation, click the Yes button if you
do not want to lose your work.
To close just the current presentation you can click on
the File drop-down menu and choose Close, you can then click on
the File menu and choose New to start a new presentation without
having to close down PowerPoint and start it up again.
To close PowerPoint completely either:
Click on the File drop-down menu and choose Exit
Click on the cross at the top right corner of the
PowerPoint window or
Click here to return to the PowerPoint index.