You should change the heart rate sensor to smart which is the green sensor blinks all the time. Also some watchfaces force to use all sensor continuously so you have to block their sensor permissions.
You mean it looks like a watch? Yeah. It is a smart watch. Moto 360 (gen. 2) design is the norm for almost all smart watches.
Samsung thankfully ditched their own horrendous design of the early Galaxy gear series and did as Motorola, use a norm...