When you first install AAF (usually via Mod Organizer 2 or Vortex), the default keybinds are hardcoded into the AAF_Settings.ini file. These are the standard controls as of AAF Beta 171 and newer.
Recommended default bindings & rationale Fallout 4 Aaf Keybinds
: If you don't use MCM, you must go to your Fallout 4 Data folder ( When you first install AAF (usually via Mod