Filter to show DHCP packets

You can find detailed info here. https://wiki.wireshark.org/DHCP

But you should be able to filter out the DHCP request with either

dhcp

or

bootp

Filter by IP Address

ip.addr == 192.168.1.1

Filter by Mac Address

eth.dst == 01:00:5e:7f:ff:fa

Better way to Filter

Wireshark has a robust set of options for filtering items.

From the Packet Details pane you can select any piece of information you want to filter, right click -> Apply As Filter -> Selected

You can also copy it and then past it in the filter bar. Right click -> Copy -> As Filter