Keyboard shortcuts

Defaults:

Alt+A   Opacity
Alt+Z   Flow
Alt+B   LAB color slider
Alt+C   Color wheel
Alt+V   Color variation panel
Alt+X   Color variation Variation on/off (toggle, no panel)

Customizing: open Settings from the tray icon to rebind any panel to a different key combination.

Disabling a panel: in Settings you can remove a shortcut entirely. A panel with no assigned shortcut can no longer be triggered. Useful if a default combination clashes with another tool you use.

Hold vs. tap

Panel shortcuts are hold-to-use: the panel lives under your cursor while the keys are down and applies on release. Alt+X is different, a single tap flips color variation on/off, confirmed by a small toast at the cursor (e.g. LABv ON).