Cell

One can see the cell setting:

// Cell settings
editor.avr.cellManager.settings

Update the cell width and color etc:

// Cell settings
editor.avr.cellManager.settings.cellLineWidth = 5
editor.avr.cellManager.settings.cellColor = "red"
editor.avr.cellManager.draw()

One can hide the cell by:

// hide the cell
editor.avr.cellManager.showCell = false;
// hide the axes
editor.avr.cellManager.showAxes = false;