Not able to navigate left to right in source

Hi Theresa, I just checked the source and it seems to be possible to move horizontally when using a track pad but not possible with a mouse. I have made a request to include a horizontal scroll on the screen to help navigate the document.

not saying we shouldn't improve the interface, but have you tried Shift+Scroll?

I think this is now resolved, because the source shrinks to fit the width of the space we have for it.