Individual application settings for 3DConnexion SpaceMouse
C:\Users\<yourName>\AppData\Roaming\3Dconnexion\3DxWare\Cfg
Or if you don't want to modify the path:
%AppData%\Roaming\3Dconnexion\3DxWare\Cfg
you find at https://www.3dconnexion.com/forum/viewtopic.php?t=38192.
See https://praxistipps.chip.de/davinci-resolve-alle-shortcuts-im-ueberblick_109348 for a list of shortcuts you can assign for Davinci Resolve (16).