When editing an H5P content in Drupal 7 the Enter fullscreen link does display the current content editing page in fullscreen. The "proceed to save" and "exit full screen" is not showing when the Drupal shortcuts are enabled. Furthermore if the shortcuts are disabled/hidden it shows the bottom of "proceed to save".
Issue is reported here: https://h5p.org/node/661600/
Drupal Versions: 7.67
Chrome Version 78.0.3904.70 (Official Build) (64-bit) and 78.0.3904.108 (64 bits)
Edge 44.18362.387.0 and 44.18362.449.0
Firefox 69.0.3 (64-bit) and 70.0.1 (64 bits)