I had the same issue with a Sercotel, emailed Choice, but never got a response...
I bet the Sercotel group left choice. There are a lot of brand changes going on post-CoVid,...
For the search, Google is your friend: Google Maps now has a "brands" feature. You can select "Choice" on the map when searching for hotels. When you move the map, all the hotels of the chosen brand will pop up...
Clever, I see that's a choice in "all filters." I will use it. I'm spoiled because some hotel chains do a good job with this. Like Hyatt has a map feature that will even tell you the award price of each hotel in the world.
Yeah, as I said, I also think Choice's partnership with Sercotel is done and Choice is too stupid/lazy to take the hotels off their website (they're not focused on their customers' time).
The good news is that, at the moment, this is only a modest annoyance as non-chain hotels in Spain are pretty cheap for summer. I've bought my Choice points in the Daily Getaways promo for a half-penny a piece, and Choice seems to (theoretically) be charging 20,000 points a night in Spain. On booking.com, I can generally replace the Serocotels with something decent for less than $100 (perhaps not in Madrid/Barcelona, but there are other chain redemptions there).