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Lightroom cache problem "Mac HD is full"

New Here ,
Oct 09, 2025 Oct 09, 2025

Screenshot 2025-10-09 at 7.23.13 PM.png

 See screenshot. Not sure why the cache is only 5 GB. Trying to move cache to external hardrive.
I Click on Mactinosh HD (cache on: Macintosh HD) and it opens a folder Lightroom Library.lrlibrary with other folders in it; the top folder with a long series of letters and numbers is hightlighted. 
I click on my Lacie External on the side menu. I thought at some point there would be a "Move Cache" or "create new cache" prompt but no. 
So I manualy coppied the folder Lightroom Library.lrlibrary, with all the folders in it,  over to my LaCie external. Thinking I could then just click on the folder with the long series of letters and numbers. But there is no "select" or "open" option, so it just stays on "Macintosh HD"
What do I do? I'm sure it must be easy. 1) either increase my cache size from 5GB or 2) move cache to external (much more free space). Step by step guide would be great. 
(by the way, for After Effect I was able to change or set up the cache for the Lacie External.)

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