Modem Vodafone Station Wi-Fi 6 does not allow to set address pool to 1 IP

When you want the Pi5 to act as a DHCP server, its required to configure static manual IP details on the Pi itself.
A static DHCP reservation for the Pi on the modem/router will stop working once you disabled the DHCP service on the modem.

You didnt mention the distro, but if it's a recent release of Pi-OS/Raspbian:

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