Default EGSpectator buttons are shown on this page: https://community.bistudio.com/wiki/EG_Spectator_Mode#Controls
Unfortunately the key binds for camcurator can't be configured by users and appear to be hardcoded in the engine.
The camera used by EGSpectator is "camcurator". This camera type is used by common spectator modes in Multiplayer games.
This default layout isn't very good for Int'l keyboard layouts and confuses people that have their own keyboard bindings (which Arma supports substantially).
The request is to support custom keybinds for camcurator.