Searching for "TERM" in *all* helps gives the following error:

>   Unknown Error
>   The URI 'xref:search=TERM' could not be parsed.

## Steps to reproduce

1.  Open Help.
2.  Click on the hamburger menu in the title bar and select "All Help". A view
etitle All Help Documents will show.
3.  Search for something, not with Ctrl+F which would only search the current
page, but instead with the title bar icon for search.

## Actual result

Unknown error is displayed.

## Expected result

A list of matching articles from different documentations.

## Build date and hardware

Build 0246, installed from USB/DVD 64bit iso.