Branching Scenario

I'm new to using the branching scenario and wonder if there is a way to add a scroll bar to the editing screen so that I can scroll down?  I know I can use full screen and zoom, but the project is long. Neither of these features help much. 

Hi I am in the h5p.org, And I am trying to set up a Brancing Scenario, but I can´t find in H5P.org.

Please help

Thanks

Henry

I've created a branching scenario with a number of MP4s added directly to the content. Everything works as expected in Chrome but when we play the activity in FireFox, the video loops while users are reading and picking their next step.