It´s a known missing feature.
Thank Rémi
But I am still not clear, is this a fault that will be corrected on a future version if so, do you know when that might be.
To others here, does anyone else experience this or is it just me?
Reminder: when I open a video in a separate window, I cannot close it by clicking on the small cross in the top right or the close function in the drop down menu on the top left.