

In the compose file for Audiobookshelf, you need to add the service itself to the network you defined at the bottom. Something like:
services:
audiobookshelf:
...
networks:
- default
- nginx
(The default
network is to keep it in the network that is created on docker compose up
).
I use Brave browser, my SearXNG instance works fine. Feel free to try it out: https://search.sapti.me/
If it doesn’t work, it might be something with your browser.