Enter the machine using adb shell
Run cat /proc/partitions
# Path Purpose Size
0 /dev/block/mmcblk0 7761920
1 /dev/block/mmcblk0p1 data 6085631
You've probably stumbled upon this researching how to remove the Xbox Game Bar. This gist includes a few different methods you can try. Please note that some of these first options are probably not be available unless you are running an older version of Windows 10.
EDIT: make sure to check out the comment below from @nmhung1985 which seems to be working for most folks.
(this is no longer an option on any recent Windows 10 build)
Xbox
or Game Bar
, until you get the Xbox Game Bar app to appear in the results.