After document comparison is initiated, a dialog with the list of changes shows up, obscuring a large part of the screen. This is not always convenient. I would rather close this window and have an option to go from one change to another in order. This would be ideally done with a prev/next pair of buttons. 

It may seem that these buttons already exist. If you click on a change in that special dialog window, two arrows appear in the right corner of the toolbar. But they work in a strange way – they move you between changes that you already have visited using changes dialog only. If for example, you click only on the first change, then next/right arrow will be grayed. If you close the dialog immediately, these buttons do not appear at all.

The required functionality is available through the menu Edit-Track Changes-next/previous, but this is very inconvenient. There should be either prev/next buttons somewhere on the toolbar, or the should be a keyboard shortcut

Current prev/next arrow buttons are misleading. They move through changes that were previously visited via dialog only.