The field editor cascade is a [[cascade|Cascades]] used to choose a template for rendering the field editor within the [[EditTemplate|$:/core/ui/EditTemplate/fields]].
The default field editor cascade only contains one element:
# Use the tiddler $:/core/ui/EditTemplate/fieldEditor/default to render the field
See [[Customizing EditTemplate field rendering]] for more details.
You can see the current settings for the field editor cascade in $:/ControlPanel under the ''Info'' -> ''Advanced'' -> ''Cascades'' -> ''Field Editor'' tab.