Okay, I have two more suggestions, as shown in the figure. The places marked with red lines are where I think improvements are needed:
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The header is too wide and takes up too much space. It is recommended to reduce its height slightly.
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Comparing the right and left sides, the left side has a larger width and dense content, while the right side has a smaller width. Once there is a colored background, it will obviously lose balance. The larger the monitor screen, the more uncomfortable it will be.
I suggest using a light gray for the background color, increasing the width of the right sidebar, and adding some collapsible function buttons. I found a reference case with a similar style:
Reference https://mail.google.com/chat