thanks for your feature request - very happy you like the app!
There is no reply because I can't always respond to every single post in this forum. I wish I could, but there so many posts in this forum (as you can see) and I can only dedicate a small amount of time every day to it. My job also includes app development, (mail) support, marketing, accounting etc. etc. And I have other apps too, so there is just not enough time.
I haven't removed your post and it is open for others to chime in and add their thoughts. If there is demand from multiple users, I will eventually see the importance. But this hasn't been the case for this feature request (yet).
To your request: I think only a smaller portion of the users are adding a lot of information to the "details" field and in my eyes, that field isn't that small for quite a lot of text to be added. I wonder what kind of information you add to it? Can you post an example? I personally never added more than 1 line of text in that field. You can also create multiple work units per day and then separate your details among all those work units.
I try to only change things in the app when I really feel the need to and when there's a real benefit for the users. Every change I make to the app could potentially cause problems for other users and I end up spending much more time than I anticipated.
I don't say I will never implement this, but more users would have to ask for it and I would have to see the real benefit of adding a flexible width of that sidebar.