As stated a few times in this thread, the terminal commands, TinkerTool, and any other apps out there that offer this feature to turn off Liquid Glass will cease to work in macOS 26.1 upon its release. This is because all of these apps, and the terminal commands behind them are simply turning off/on a system flag which Apple left in Tahoe's initial release, but is removing in the next release.TheBart – you're saying that adjusting this key apparently has no effect in macOS 26.1?
That's not to say that in the future somebody might figure out another way to turn off Liquid Glass, but I wouldn't bet on it.