From the browser (desktop or mobile), go to your settings dropdown (the "gear" symbol at top right). Select General Settings, and under Thread Display Options change Thread Display Mode to "Linear - Newest First". That should do it.
From the browser (desktop or mobile), go to your settings dropdown (the "gear" symbol at top right). Select General Settings, and under Thread Display Options change Thread Display Mode to "Linear - Newest First". That should do it.
In the app, you can go into forums then tap the down arrow at the top in the middle and select "latest posts" (if you want to control on a more manual basis vs. automatic).