in focus mode background issue

Hi,

When using the focus mode in Decktop everything works fine, the issue I'm having is the rendering online.

When using in focus on a graph it seems to be only semi-transparent so I can see the rest of the view through the graph.

Even when giving the graph a background it partially erradicates the issue but I can still the see view in the background along the top which can make the 'Back to 'Report' hard to find for the end user.

Is this a known issue or something basic I'm missing?