Dropdown lists (like the preset selection) can be navigated with the keyboard, including folding/unfolding items and choosing an option (using [Enter]). The left navigation pane also supports this feature.
Floating windows and widgets (like pop-ups, error messages and dropdown lists) can be closed using [Escape].
To go to the previous page, use the [left arrow icon] button in the top left or press [Alt]+[Left Arrow]. To then go forward again, use [right arrow icon] or [Alt]+[Right Arrow].
The meter bar shows everything that is relevant to the currently viewed page, with less relevant but useful metering folded. Click the [dots icon] to unfold a folded meter. Click a meter to go to its page.