You can find links to the hotkeys & a lot of other FWL16 info on this page
frame.work/laptop-16-support
- Hotkeys on the Framework Laptop 16 Keyboard Learn more
- Default Keymap for the RGB Macropad Learn more
- Default Keymap for the Numpad Learn more
- Customize key map and RGB lighting Customize
Note that there is an error / missing hotkey on those lists, at least for the currently shipping firmware on the keyboards.
Fn+C is toggle Backlight Breathing on/off, for the keyboards.
Numlock off + + (the plus symbol) is toggle Backlight Breathing on/off, for the numpad.
It’s not present on the macropad.
Source: the current firmware
ansi github.com/FrameworkComputer/qmk_firmware/blob/v0.2.9/keyboards/framework/ansi/keymaps/default/keymap.c
iso github.com/FrameworkComputer/qmk_firmware/blob/v0.2.9/keyboards/framework/iso/keymaps/default/keymap.c
numpad github.com/FrameworkComputer/qmk_firmware/blob/v0.2.9/keyboards/framework/numpad/keymaps/default/keymap.c