How can I find out how my Google Drive storage space is being used up?

I am trying to clear space in my gmail. I have deleted a load of photos and videos in Google Drive.  Having subsequently emptied the Trash, the space used has now gone down from 30GB to 20GB. See the details of my Google Drive usage below. The size of my files stored in Google Drive is ~3GB. I found this out using the Google Drive folder in my windows profile. There are various folders that have been shared with me. One folder has been shared with me but I have write privileges and so I have uploaded some photos to it. Do those photos use up my Google Drive space even though the folder is owned by someone else? (This folder appears in "My Drive" and in the "Shared with me" folder.  All the other folders that have been shared with me appear only in the "Shared with me" folder.)

The main problem that I have is that I am unable to establish where my storage space is being used up, owing to the fact that Google Drive has no "right click > properties" function. I am wondering if there is some kind of Chrome Addon that would enable me to have this kind of function.

Thank you

20.11 GB used
Drive      14.97 GB
Gmail      5.13 GB
Google Photos      0 GB
30 GB total storage
Your plan      0 GB
Provided by your domain      30 GB
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Now ThenNot applicableAsked:
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FibertronTechnical ConsultantCommented:
I have used the following info to resolve space issues on Google Drive:

To check your storage, go here: https://www.google.com/settings/storage
To see the exact files taking up your quota, go here: https://drive.google.com/corp/drive/quota
Here is a great article that goes over a few methods on managing your google drive storage quota: https://support.google.com/drive/answer/2409676?hl=en

Info taken from this article:
https://productforums.google.com/forum/#!topic/drive/UVlnc_keBHQ

Hope that helps!

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Now ThenNot applicableAuthor Commented:
Thank you. The second link is useful.

I would still like to be able to find out the size of folders.
FibertronTechnical ConsultantCommented:
There's no easy way to view the size of individual folders but here is a workaround that takes a little time but can provide more detail on folder sizes... (It is using the Backup and Sync program from Google)

https://www.wikihow.com/Check-Folder-Size-on-Google-Drive-on-PC-or-Mac
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