The SBL Greek New Testament includes a simple critical apparatus listing variations between various eclectic editions of the Greek New Testament (Westcott-Hort, Nestle-Aland, Robinson-Pierpont, etc.). I have tried to search on these notes without success.
In Matthew 3:1, for example, there is the following footnote:

The surface text of the SBLGNT has εις, whereas τὴν is listed in the footnote for some editions. I have tried searching on all of the search fields, including Variant reading and Variant Unit, but I cannot find this verse. Even if I select all of the search fields and search for τὴν, I still do not get this verse if I do a Bible search.
The only way I seem to be able to search in the critical apparatus is through a Basic search. Then the search fields are searchable. But in the Bible and Morph search, checking off the various search fields does not give me this verse or others with this text in the footnote.
How can I search on these footnotes containing the critical apparatus using a Bible or Morph search?