On my wife's copy of PSE10, I clicked the Move tool when on the top/image layer, and fully expected to be able to drag one of the handles to resize it, jut like I do it in Photoshop. Not sure why I can't do it. Make sure 'Show Bounding Box' is checked.
Thanks for your input on this. It has been really helpful. Attached is a test pic. I couldn't find the "Show Bounding Box" option but did find something called "Transform" that allowed me to reduce the subject image over the blank background. Once that was done then I applied the drop shadow effect.
Still working on this to become a bit more proficient.
I'm only happy to help, especially hen my help enables you to show us a great image. While scrolling quickly, I thought I saw the banks of the Seine due to the old-timey processing. Scrolling back, I see the trees across the lake. Yes, time for new glasses.
You might also look at Tim Armes' LR plug-in call LR/Mogrify. While it cannot generate a drop shadow, it has all sorts of features for quickly determining how your images are presented, including borders, text, annotations, watermarks, etc. It does many other things too. And it works seamlessly with LR. When you go to export an image, all of the features are there to select.