Click View - Click Properties Editor - Click Undock Properties Editor
Once undocked, click on it and drag to place it where you want. You re-dock using the same method.
If you close the PE or "lose" it, simply do a fast left double click on your page background and it will re-appear. You can also go back to View and retrieve it from there as in the steps above.
PROPERTIES EDITOR ~ Page Properties ~ Basics Tab
Next we will address the three tabs on the Properties Editor - Page Properties menu.
The Properties Editor (PE) is your builder. Using the Properties Editor and the Toolbar Buttons you will build your site. The best way to familiarize yourself with PE and the Toolbar Buttons is to practice. Open a new page and dive in. You can save the page as Practice or Play or whatever you wish to name it. Be sure to insert the No Index, No Follow tag to prevent it from being picked up by the search engines in case you publish it.
When you first start out, the PE is affixed to the right hand side of your page. If you want to undock it, go to the toolbars in the upper left of the page.