Split-view for channels

Threads does it, why not channels?

I've seen a number of posts on this site about this feature, but I would like to make my own post with my own ideas for what we could see with this feature.

First of all, we need a dedicated "split-view" button inside of channels. As the name suggests, this button will force a channel into the right-hand side of the screen for the user to interact with

Another thing I believe is vital (and missing with thread's split-view) is the ability to resize the sidebar. Being able to drag along the edge to enlarge/shrink both sides would be extremely useful to those not focusing on a certain side, but still wants to see the channel update.

I also made a short video concept demonstrating how this feature could be implemented in a similar fashion to how it was with threads: https://youtu.be/IT-t8CZQ7aU