I too have this problem. The App allows the creation of a gant chart project schedule.
My work around is to use a scrollable screen, put the gallery / galleries into the canvas. Then make the canvas height something big like 8000. Then change the gallery height to 7500.
This allows the canvas to scroll and because of its massive height the vertical scroll bars arent required in the horizonatal gallery. It is clunky and I dont particuarly liek this soloution. Works okish on a touch screen but its clunky as hell on a normal display
Hope this helps and that someone has a better solution