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You can change the port priority for Gi1/1 on SW4 as follows:

SW4(config)#int gigabitEthernet 1/1 SW4(config-if)#spanning-tree vlan 1 port-priority ? <0-224> port priority in increments of 32 SW4(config-if)#spanning-tree vlan 1 port-priority 64

On SW2, you can see the designated port ID for Gi1/1 is now 64.6, and it's the root port:

SW2#show spanning-tree vlan 1 interface gi1/1 detail Port 6 (GigabitEthernet1/1) of VLAN0001 is root forwarding Port path cost 4, Port priority 128, Port Identifier 128.6. Designated root has priority 32769, address 0015.fa83.e900 Designated bridge has priority 32769, address 001d.45cf.e800 Designated port id is 64.6, designated path cost 4 Timers: message age 15, forward delay 0, hold 0 Number of transitions to forwarding state: 3 Link type is shared by default BPDU: sent 43, received 1851

The converged topology is shown in Figure 2.6.

Figure 2.6 Converged VLAN 1 topology with SW2 Gi1/0 blocking