Show File/Folder Size

[pramitbiswas]

Is your feature request related to a problem? Please describe.
Seeing the size data (or percentage) gives an intuitive understanding.

Describe the solution you'd like
I used Fx earlier, this was very useful.

Describe alternatives you've considered
Fx Explorer

Additional context
None.

[EmmanuelMess]

This is already implemented, as part of the properties and in the storage selection.