Cycle groups and shortcuts
One shortcut, one short list of layouts.
A group is an ordered list of layouts with a shortcut. Press the shortcut and Langouste moves to the next layout in the list, wrapping around at the end.
Recording a shortcut
Open Settings from the menu bar icon, press the shortcut field and then the keys you want. Use ⌘, ⌥ or ⌃ with Space, an F-key or an arrow, or tap Fn on its own; letters, digits and signs are refused because they are typing. Two groups never share one. Add layouts from the ones enabled in macOS and reorder them with the arrows.
Outside the list
If you are typing in a layout that is not in the group, the shortcut brings you to its first one. A group with one layout simply selects it.
As many groups as you like
Keep ⌘Space for the pair you use all day and put the rest on shortcuts of their own.
Other shortcuts
Every other key Langouste reacts to is in Shortcuts at a glance, and the shortcuts that fix text are under Fixing text.