The position of the series picker in evolution graphs currently moves with the number of selected elements. To improve the usability it might be good to give it a fixed position either completely left or right.
Thanks for the report. Maybe this is something that could be done at the same time as: https://github.com/matomo-org/matomo/issues/955 where we'll introduce a very valuable icon/button to switch the graph periods from weekly to monthly/daily/yearly
Edit: maybe we could also choose a different icon without this thick border?