I second this. Came to see if there was a solution but looks like it's built this way. Very disappointing. Even has black bars on either side, at least on my resolution. Previous years allowed for true full screen and would auto-hide the navigation after a few seconds of inactivity. Would love for it to come back...using alternative apps as I can, in part due to the poor presentation of the web version.
Hi Guys @amit916
On the bottom right corner you will see a box, select that and change it to "pop out". It should open the stream in a new tab and when you full screen the navigation bar wont be there.
I just tested this on an old game and it worked.
Let me know if you still need help.