STM32G474RB，128K flash，then datasheet show that 512K。And does RB and dual bank mode？

1�?why datasheet show that STM32G474RB has 512K Flash。But STM32CubeMX show 128K？

2�?does the STM32G474RB has dual bank mode？

3�?STM32G474RE，when dual bank，bank1——0x0800 0000~0x0803 FFFF，bank2——0x0804 0000~0x0807 FFFF。

so if STM32G474RB has dual bank mode，then bank1——0x0800 0000~0x0800 FFFF，bank2——0x0801 0000~0x0801 FFFF？？

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thanks very much�?�?​