Why doesn't GoogleDrive save local storage with file status "onine only"?

For GoogleDrive for desktop, there are two statuses for any files, "available offline" and "online only". And it is said that "if you select a file or several files to be available offline, this means that the app will actually download the file in your computer to make it available at all time even when you don't have an internet connection, of course, this will take up the storage of your computer. The Online only option, it's self-explanatory, the files in Google Drive are synced but not downloaded in your computer, and they are only available when you have an internet connection". 

But when I tested it with some big file, I found something weird: 
- I got 180G left on my computer at first, then I copied a 20G file to the google drive folder; after the copy, the sync was finished, there was only 160G left on my computer disk - and it didn't change whether I made the file "available offline" or "online only". 
- I also tried to upload a big file with an internet browser, then made it "available offline" and synced it with GoogleDrive for desktop, then, of course, it took up more storage of my local disk, but after I made it back to "online only", the storage didn't change. For the details, please see the attachment (here). 
 
I wonder how can I solve the problem? I hope GoogleDrive for desktop can save storage of my local disk. 
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@Kang there's a couple of articles you can have a look at:

This gives you the general settings and the two most likely of interest are:

  • ContentCachePath
    Please heed the warning

  • ContentCacheMaxKbytes

    so you can set the maximum size of the cache

  • MinFreeDiskSpaceKBytes
    so you can set the minimum amount of disk space needed

This second article is a user-to-user discussion on how others have been successful/unsuccessful with clearing the cache:

I hope these help.

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