The biggest one seems to be the unsticking of threads to the sidebar, a few months ago it was changed where threads stick to the channel you open, if you move t

The biggest one seems to be the unsticking of threads to the sidebar, a few months ago it was changed where threads stick to the channel you open, if you move to another channel the sidebar is closed and a new context for that channel is now available. There's also a new pop-up window button for threads, you can split out the thread view into a new window. It's a change I didn't enjoy so much, my workflow when replying to a request from another team was to leave a thread open and navigate around Slack to ask other teams while copying data from the original request for other teams to troubleshoot, now I need to pop the window out while navigating to other channels. I miss tabs and split views, I have no idea why Slack hasn't implemented those, it'd help a lot to keep track of multiple channels at once (for example when managing incidents).