While in Grid View of the Library module, I can select multiple photos and add a keyword to all of them at the same time. I can do that by either opening the Keywording panel and clicking on tags from Keyword Suggestions or the Keyword Set, or by typing it in. I can also do it by the way of a shortcut, which in my case is Alt + 0 - 9.
But when I switch over to the Loupe View, I can only do this for one photo at a time. I like working with the Film Strip. So while in Loupe View, I usually have the Film Strip displayed at the bottom. In the Film Strip, I can click on one photo, hold down Shift key, and then on another photo to select all the photos in that range. But when I then try to add a keyword to all of them in one go, only the photo that is in focus, i.e. the "active photo" or "target" gets the keyword tag. (That's the photo in the selection that is lit up and displayed in the Loup View.)
Is this by default, by design, or just a bug? And is there a way around this limitation?
I noticed there's an option titled Show Metadata for Target Photo Only under the Metadata menu. But this only has to do with what's displayed in the Metadata panel when you're in the Grid View. For example, if you select five photos with different exposure settings, you will see
Exposure < mixed > in the Metadata panel. So what this option does, is it allows you to have multiple photos selected in the Grid View, and only have the exposure setting for the "target photo" (most lit up) displayed under Metadata.
While this might seem like irrelevant, it's quite interesting. Because what happens when you have this option enabled, and you switch over to the Loupe View, is that you loose this ability. In other words, while in Loupe View, even though you have that option enabled, you will see
Exposure < mixed > instead of exposure setting for that target photo you have in the Film Strip. Once you switch back to Grid View you might see something like
Exposure 1/100 at f/5.0 or whatever your exposure is. So this option is not available in Loupe View. So it should really be titled Show Metadata for Target Photo Only, and Only in Grid View.
So just like with keywording, some functionality in Lightroom seems to get lost when you switch over to the Loupe View. While the Film Strip allows you to make multiple photo selections even when you're in Loupe View, you can still only work on one photo at a time.