If you would like to move the preview pane please follow the steps below:;
Within DPSOneoffice, click on User at the top of the screen.
In the dropdown menu that appears, click on Options.
In the options menu, you will see a button that says View near the bottom. Click on this.
Here you will see a section that says Document Preview Pane. There are two dropdowns. Click on these and choose either Bottom or Right depending on which you want.
Click Ok.