On devices with the Neural Engine (iPhone 8, X, and XS), Spectre can help you stabilize handheld shots.
First, check the stability indicator. It will wobble around as you move your device. If you hold it steady for a moment, "STABLE" will appear.
When shooting in normal mode, the stabilizer is active when "STABLE" is visible.
In scenes with a lot of motion, or lack of sharp details, Spectre can have troubling stabilizing the shot. If you don't like its results, tap the stabilizer to disable it. The stabilizer button will turn grey, and the icon will stop moving.
Currently, stabilization runs very conservatively in light trails mode, to avoid gaps in trails. This will be improved in an update in the near future.