Hello Miki,
I've just come across your post. We disabled 'last access' for our students.
This is how it's done (version 1.8 and 1.9) : Go to the admin menu - users - permissions - user policies.
Scroll down to the bottom of the page -' hide user fields' and click on 'last access'.
Cheers,
Ulrike
Roles and permissions
How Do I hide 'Last Access' from students only?
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