The former search screen based on Transdroid Search is available as a separate application on F-Droid. F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform.
The seach app is open source, you can find the source at https://gitlab.com/tagsoft/ttorrent-search.
Usage is simple, set it as the search app in tTorrent settings.
A workaround exists to use transdroid search on recent versions: