Apparently the secret was to just reboot the physical server. After my backup ran last night (server shutsdown during the process), the search button in it works! I'm sorry I didn't do that sooner.
Joomla 3.9.27 - newish install, not a lot on it, in development on XAMPP
Jdownloads 220.127.116.11 - Fresh Install
Thank you so much for your response!