First, there is not column called
Folder Size, it's
File size, and to be able to apply the
sum function. the
File size should be selected to show as a column in the view.
Steps to show Sum files size
- Open your library > from the above ribbon > Click on Modify view.
- In the column section, select File size.
- In totals section select file size and sum.
- Now the file size should be shown as below.
Note: To show the
File size of a folder, you should be inside this folder, and if you have subfolders inside the main folder it will not be calculated in the total of the main folder.and this case you can open your library via explorer from the above ribbon and check the properties of this folder.
Note: In modern Mode, the Total is not available. it's only available in classic mode.