Hidden NIK Menu

When exporting from PL5 to NIK the first time after opening PL5 it’s fine but thereafter the NIK menu is hidden behind anything else open and it will not allow me to minimise the PL5 screen. The only way I can get to the NIK menu is to open safari and then close it to reveal the NIK menu. It then works fine but it’s a bit of a pain having to do this every time after the first image. Is there a setting I have wrong?