Hi, Mike,

There is a new button in the toolbar of the PDF Viewer. It's the 5th button from the left and immediately right of the vertical Fit to Page button.

When you hover your cursor over this button, what does it say? 'Allow overlap'?

If so, click the button to change the setting to 'Stay on top'. When you close the viewer and open it the next time, it will remain on top of the grid (rather than immediately hiding behind OE). You are still able to click on other documents in the grid and the viewer will either display the contents of the document if they exist, or be blank indicating *** No document to view *** , until you close the viewer.

The other behavior has been reported to R&D for you.