When a project consists of many columns marked with different colors, it is difficult to find which column is currently active. At the moment, the active column is marked with an orange background or border in the header and a light blue border in the media section.

I suggest that the active column should have a distinct, bright (orange?) thick border and a background of the same color along its entire height, including the headers and layer separators, which are currently always dark gray.
See example: https://imgur.com/a/pIaGQM7

I believe this small change would significantly improve the user experience.