I can't seem to access security tab for my drive E: in Windows 10. The one when you go to properties:
I tried all recommended methods I could find online but they don't work for Windows 10.
Any idea how Microsoft wants us to enable it now?
Already mentioned in the comments, FAT does not offer any Security in terms of permissions. Change your Filesystem to NTFS and you will see the security tab. Before you change the Filesystem, save all your Data somewhere else.