I believe you need to convert the cookies to the format that BAS understands, and then import them into BAS using a standard method.
Take a look:
https://chromedevtools.github.io/devtools-protocol/tot/Network/#type-Cookie
@tet-vivi I just did some of it myself, unfortunately I currently don't have enough time for such gimmicks, maybe someone else can finish it :)
Unfortunately, I haven't found the correct files for the left menu yet...
Edited files: 23.2.0.rar
File path: %appdata%\BrowserAutomationStudio\apps

I was having some serious eye strain too.
Just add the following css between head tags:
File1: apps/{version}/html/toolbox/index.html
Add css between head tags:
<style>
.container-fluid{ background:gray;}
.panelgridtitle{ color:white;font-weight:bold;}
.panelgridtitleinner{color:white; font-weight:bold;}
</style>
File2: apps/{version}/html/scenario/index.html
Add css between head tags:
<style>
.titlebody{background:#fff;}
html{background:gray;}
.container-fluid.main{background:gray; }
</style>
And you should get a panel looking like this:
