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".
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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
This second article is a user-to-user discussion on how others have been successful/unsuccessful with clearing the cache:
I hope these help.