I've seen the same trend at the B&Ns I frequent (Montgomeryville PA outside Philly and Northville MI outside Detroit) — in the past year or so the tech shelves have thinned out by 50%, same for the science and math, toys and games have grown by 100%, no more music, big reduction in movies, magazine offerings are fading and all the seating near them has disappeared.
I frequent B&N because I badly want a seller of new books ro survive, but I so seldom buy anything there anymore, I find I'm visiting less and less.
I went to a B&N for the first time in probably at least 5 years a few weeks ago.
The music section was outstanding; it was clearly curated by multiple music lovers and I saw stuff that I would never have guessed would be available on vinyl in a chain store.
Probably around 40% of the bookshelves were dedicated to stuff teenagers or younger would like, and they had a ton of sci-fi and fantasy (both adult and children), including a bunch of copies of a fantasy book my daughter wanted that the B&N website said was available online only.
I frequent B&N because I badly want a seller of new books ro survive, but I so seldom buy anything there anymore, I find I'm visiting less and less.