Display grouped name in header

[Ratatosk]

I’m making a year planner that is grouped by column “Måned”(Month) into 1-12.

When I for example click on 11 in the first image below, I go to the second view which is the second image below.

But there is no indication that it is showing which month is currently being showed.

Do I have to display month on each row or is there a clever workaround?

I use the group by _rownumber trick.