External drives show up as their own drive letters. Wine only gave a letter to removable media, so an external SSD or hard drive was reachable only through Z:\Volumes and Steam could not offer it for a library. Highball now links each mounted external drive to a free letter in the environment before a program starts, and Windows sees it as a fixed disk, so Steam lists it under Settings, Storage. A drive keeps its letter, so a Steam library on it is found again after you unplug it and plug it back in. Letters Wine or you made are left as they are. If the environment is busy when a drive arrives, the letter shows after its next start.
Add games is a page now, with Steam, Epic, a Windows program you have, and the other launchers, and an environment's settings open as a page with Graphics, Display, Compatibility, Windows components and Advanced sections, from the environment list, the environment page or a game's page. Thanks to @matiasmg-ok (highball#265, highball#253).
Age of Empires II HD's launcher draws its buttons. The game asks for Palatino Linotype, which macOS names Palatino, and the launcher drew no text without it. Every environment now maps that name, unless it already has a mapping of its own. The game's page also skips the intro movie it closed on. Thanks to @NorseGaud (highball#272, highball-db#360), who also added a script that rebuilds and reopens the app while you work on it (highball#271).
The library remembers its filter chips (store, Installed, Verified) between launches, and an installed game's tile keeps its Play button in the corner on hover instead of swapping it for a big centred one. Thanks to Hayden on Discord for both.
A game's empty Launch arguments field now reads None. Its grey example, -dx11 -windowed, looked like arguments already set, and a player tried to remove them.