User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-3236835-20210102060921/@comment-3236835-20210102104558

No such option appears on Preferences, although it does have it on my message wall. However, it was already checked to hide deleted comments and only affects the message wall itself, not the page comments.

Blanking comments does just that, blank them, but still leaves the now empty comment boxes on the page.