How did you "clear off" what you don't want anymore?
When deleting from within LrC, it asks you whether to only remove from LrC catalog, or also from the storage/disk.
What did you answer, because the first does not free space on the disk, whereas the latter does.
A test: While being in the library, right-click on the topmost folder in the folder panel and select to synchronize. What does the output show?
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