Why does the right mouse button fail to respond in the Character Event graph, but the left mouse button does?

Works for me. Is either of the buttons bound to an input event in the input configuration, perhaps?

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How do I solve the problem that the right mouse button Event in Character Event Graph cannot respond when using the right mouse button Event in other Blueprint Event Graph?

There are two ways.

The better way, is to route all input through the Player Controller, and have the Player Controller figure out where to dispatch it to.

The hacky way, is to override the input target such that whatever thing should handle the event, is the target, and switch targets when focus changes. (“Switch Targets” can happen by enabling/disabling input for specific input-enabled actors.)
This is pretty well documented here: Input | Unreal Engine Documentation