Label and scale toolbar

At the top of the view is a bar with two slider controls:

• Scale. This controls how much of the horizontal layout is visible at once. scrubbing to the right expands the scale, i.e. fewer items are on screen at once.
• Label. This controls the size of the labels which also affect their height and thus the vertical amount of content on screen. Scrubbing to the right enlarges labels, meaning fewer are on screen.