I'm looking for the "Display Thread Filtering Buttons" settings, as shown here:

But this option does not seem available to me, see screenshot in attachment.

When I use the search option in settings, it is displayed in the drop down menu (see attachment), but when I click the search result, it takes me to the page that's shown in attachment (without this toggle option).

Is there some setting I need to activate first to make this available? Or am I looking in the wrong place? I've looked through pretty much all settings, but it's nowhere to be found.