In order to display the column date last saved in file explorer do the following:
1: open windows explorer, go to a folder, and right click the header row, to the right of the last column, and click ‘More’.
2: Scroll down and check ‘Date last saved’, and click OK.
3: To make this the default view for all folders to the following: In the same folder, click View, in the top menu-bar, click Options, and ‘Change folder and search options’.
4: Click the View tab, and click ‘Apply to Folders’.