Problem with Plug in and the Side Panel Outlook 2016. The side Panel don't appear in the outlook windows but

Hello,

My computer is microsoft surface pro, high resolution with windows 10 64 bits

Outlook 2016

The Side Panel doesn't work properly. It appears in a windows so that i would like it to be in the outlook windows (on the right).

Is someone has got this problem? And how can i solve it?

Thanks