I've been tagging images with keywords for a dozen years, and have learned a few things in that time and would now like to batch-delete some keywords. For example, I've tagged thousands of images with ", aspect-P" for images with portrait orientation, but that's not something anyone would ever think to look for when searching my images, and it's easy to sort by width or height to see all the portrait images in one place. I've tried Find and Replace, with ", aspect-P" in the Find box and the Replace box empty, and when that didn't work, with "" in the Replace box, which didn't work, either. I'm searching Metadata, with only Keywords checked.
FWIW, I found an ancient thread from 2006 which indicates it worked way back then. Has the batch-replace capability been removed, or am I doing something wrong?