Yaak's Timeline View
[Tools, Yaak]
One of Insomnia’s strengths was its ability to display the raw HTTP traffic between the server and the client.
You could access it using the Console tab, and it looked something like this:

Yaak, as of the official release, 2025.9.3, does not have this.
But the beta, 2025.10.0-beta.8, does, via the Timeline tab. This is a feature that was added as of Beta 6.

This allows you to see (most) of the traffic.
TLDR
The Timeline tab in Yaak allows you to view the HTTP traffic between a server and a client.
Happy hacking!