Unused space in new versions of Adobe Premiere

Hello everyone! 
I have been working in Premiere for decades. And I suggest that we come up with something with the design of the program. After version CS6, there was a lot of extra space that is not used in any way.
For example, look at how it was in CS6

and how it is used now

Let's say if I don't use a microphone and I need to remove the icon, I can't do it, even in manual mode.

If I remove the unused space that I marked with red frames, working with the timeline will become even better and more comfortable.

💡And another wish. I remember in CS6, when there were a lot of video clips on the timeline, previews were displayed on all videos and you could see which clip was better to move to a particular part of the timeline,

but in new versions (for a long time now) this option has disappeared and previews are no longer displayed when the timeline size is reduced. This does not affect the computer's memory. In CS6 I used an older computer than now.