I found a workaround: pressing and maintaining the space bar activates the Hand tool. It works like in all desktop Adobe products. It's possible to click&drag vertically and horizontally.
It works on Mozilla for Mac and Chrome on PC.
Otherwise scrolling is possible by these two ways:
1) the scroll wheel of a mouse but limited to vertical scroll
2) the trackpad of a PC or Mac, two fingers swipe (both vertical and horizontal scroll work)
I found a workaround: pressing and maintaining the space bar activates the Hand tool. It works like in all desktop Adobe products. It's possible to click&drag vertically and horizontally.
It works on Mozilla for Mac and Chrome on PC.
Otherwise scrolling is possible by these two ways:
1) the scroll wheel of a mouse but limited to vertical scroll
2) the trackpad of a PC or Mac, two fingers swipe (both vertical and horizontal scroll work)