In Wireshark, there are several protocols that we can modify so that Wireshark can display the data more in line with the way the protocol should be used, according to our preferences.

In some cases, a protocol won't have any protocol preferences. For example, when selecting IGMP, Wireshark states Internet Group Management Protocol has no preferences, as shown in the following screenshot. However, there are preferences for many protocols, including TCP:

To modify TCP preferences, go to frame 1 and select the TCP header. Right-click and select Protocol Preferences, as shown in the following screenshot:

Above Protocol Preferences, there is another option, Open Transmission Control Protocol preferences..., which will open the Wireshark preferences:

Once the Preferences dialog box is open, you can select and modify some of the TCP preferences.