My Samsung phone updated last night and now

[usonian]

5. Here's a hint.

Phones have very little real estate, so some controls that you see on a tablet or desktop disappear.

No doubt, your cookies got cleared, if they held that preference.

Not knowing where to look for this under My DU, can you log in from something with a large screen and set it the way you like?

That preference should be stored in your browser cookies or your profile on the DU server. (I suspect the latter)

An admin may answer. Good luck.