networking - Why I can still access modem GUI when it is bridged?

I am talking about ISP Modem that means it is a modem/router/switch combo. When I am not bridging I understand the diagram as such,

The router receive the ISP IP address and route to internal network 192.168.1.0/24. In this case HostA can easily access router GUI via 192.168.1.1.

I can't picture what happened during the bridged mode and how HostA can still access 192.168.1.1?

I understand that when bridging, it behaves simply like a tunnel so the ip address should "flow" through the port right? Please help me picture the basic network topology of modem/router/switch combo under bridged mode.

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