XF 1.5 Default to "Show OnLine Status"?

I assume that if a user has the "show online status" box checked under their privacy settings, that the member's card will show "so-and-so" was last seen at a certain time and date, meaning the last time they logged onto our site, as shown in the photo below. If that is correct, please let me know if there's any way I can edit all our user's accounts at once, rather than one at a time, to make sure that all members have that box checked as the default. If I'm wrong, and there's another box (maybe the "show current activity" or another box to be checked that triggers that result, please let me know.
BTW "show online status" is already the default setting for all new user registrations. I'm trying to do a mass edit of all our old users.
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