Basically, what was said here, but it seems the sidebar aspect is being overlooked/unacknowledged from what I can see: https://feedback.clickup.com/feature-requests/p/edit-tasks-inline-or-on-a-sidebar

This is the major thing I find difficult with migrating from Asana to Clickup. Having the modal cover up everything and having to close it is bothersome. Asana's design choice in this regard is just far more pleasing to the eye and uses less clicks. I prefer the task items to not fill up the whole screen anyway, finding the feeling on my eyes rather similar to websites that let paragraphs stretch wider than they ought to (making them uncomfortable to read).

Making the split screen an option (rather than mandatory) at least would be acceptable. Other than an on/off switch, this is pretty much a front-end feature.

The screenshot I've annotated comes from an official Asana tutorial, so credits to there.