@Egika Yes, the indicator is displayed, but only after you switch to the “BARO” page. You obviously don’t stay on that screen 24/7 (if only because button lock and additional views don’t work on that view).
On the original first-generation Suunto Core, that indicator in the top-left was visible right on the main locked screen. The huge advantage was that when you were at a camp, for example, a quick glance at the watch told you how the weather was developing without having to switch over to the barometer— but this feature has disappeared.
Don’t worry, I’m not jumping to conclusions; I’ve gone through the whole watch and read plenty of reviews, also I’m owner of first generation for years.
The feature I’m talking about simply isn’t there. Besides, on the BARO screen itself, that trend indicator is practically useless anyway since you already have a detailed graph right below it.