Previous trading day vs last 1 trading day

Why do these values differ? (Edit: is ‘last 1 day’ supposed to be ‘today’?)

What’s the difference between a ‘day’ and a ‘trading day’?

Why is there no option to show current trading day?

Day equals calendar day, while trading day equals open stock exchanges.

Depending on the recent day, you can make use of both or neither.

Because if isn’t necessary, since there is “last 1 trading day(s)” already.