Plots do not size as desired

Currently, plots do not fully fill a given area. See the following image as an example. The plot has the correct width but is squashed at the top of the parent component.

Either provide height and width parameters to plots or make them fill a given bounding box.

Start by locating the plot component and its parent component, then reproduce the sizing shown in the issue image. Check the existing plot sizing behavior and determine whether explicit height and width or bounding-box filling is supported. Done means plots fill the requested area without being squashed at the top.

Written by the indexing model from the issue text.