Nodered_pfc8574 addresses too restrictive in UI settings

I am a noob tying to use to control 3 relay boards but the addresses are 0x14, 0x15, 0x16 not 0x38 & 0x39 that the UI settings allow to be set from the drop down combo box. Is it possible to edit the address in a text file somewhere outside node-red so that I can set the addresses I need? but also so I can have 3 off pcf8574chip nodes in the system?

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