I am exporting thousands of shots for my website and I am making a customized watermark/copyright title for each collection. It is working fine except now I have quite a few customized watermarks which I probably will never use again. How do I remove these from the pull down menu?
If there really are a lot to get rid of, it might be quicker to simply delete them from the "Watermarks" sub-folder in your Lightroom settings folder using Finder/Explorer. Best done while LR is closed down.
You can also delete them directly from the Watermark Folder if you have quite a few to do. Ian's method has the advantage of getting to see what it looks like as you delete it.
Windows Location : Users\App Data\Romaing\Adobe\Lightroom\Watermarks, Mac Users\Library\Application Support\Adobe\Lightroom\Watermarks
It's the same procedure in LR4: Start the Watermarks editor, then use the drop-down at top left to select the watermark you wish to delete. That loads the watermark into the editor, then go back to the drop-down again and now you will see the additional options, including the "Delete" option, as per Ian's screenshot above.