We noticed that our manual alignment interface becomes slow for large files. Therefore, we made some improvements, of which the most important is that the nice buttons will be displayed by default just on the active paragraph, when the mouse is over it. Here's an example:
The mouse (not visible) is over the third paragraph in the left column. If you move the mouse outside the paragraph, the buttons disappear and new buttons are generated on the fly in the newly active paragraph.
Otherwise, the capabilities of the manual alignment tool are the same. We will update the tutorial further down the line, perhaps after we implement more improvements. Here's an example of an alignment job generated with the new interface.