How to configure the DHCP to make a priority between the subnets inside same shared network

[red1 red]

Dears

I configured a shared network containing a multiple subnets , with this
actual config , my DHCP is serving the clients with differents IPs from the
different subnets randomly, wihtout appliying any order or priority between
the subnets, I'd like to configure my DHCP in order to not serve any client
from the second subnet until the first subnet if fully used.

Regards
Red1
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