An alternative to click and drag, we have the option to enable scrollbars. Here's how to enable the scrollbars feature in the Alignment view in Gtmhub:
In the Alignment view, locate "Options" in the navigation panel on the left-hand side
Check the "use scrollbars" option (blue box = enabled)
Use the "Zoom" feature in the top left corner of the alignment space to zoom in and out when scrollbars are enabled.