Selecting an author-year biblatex option

[Rich Shepard]

My document bibliography is stuck at bibtex. After installing TL2023 I
changed it to biblatex but now it's reverted back to bibtex. And the
biblatex authordate options for TL3 are not those seen by bibtex.

How can I clean this up so that Settings -> Bibliography allow me to select
biblatex and the citation and bibliography styles use those of TL3 and
biblatex?

TIA,

Rich