1. Create a BWS on the word "light"
2. Expand the Definition section and note the contents.
3. Under settings in the header line, switch to a collection unlikely to contain definitions e.g. a collection of your journals. Note it returns "no results".
4. Under settings switch to "All Resources" - note there is no "reset to default" option. Your results will return to your original contents.

Bugs/expectations:
- an explicit reset to default rather than expecting the user to know "All Resources" is the default (assuming that is the intended behavior)
- a screening of collection names to show only potentially valid collections i.e. they contain one or more resources of a resource type that could be used in the Definitions section
Note: in playing with the options, I did create Definitions sections that included all resources (literally). Unfortunately, I do not know the steps to recreate them so the bug is unreported.