it actually looks like you want to change the menu and not the breadcrums
you can do that my removing/deactivating the Home Web Link from the Default Web Link Set.. you can achieve that via Portal Studio or Portal Management App
via Portal Management app you need to open make.powerappps.com --> apps --> Portal Management
Open the Web Link Sets entity and open the Default web link set
at the links tab you will see the below, just select and delete/deactivate the Home Web Link

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