Was looking for the same. Some things about the IDE I've been able to fix using a plug-in for Chrome User JavaScript and CSS
But that requires being savvy about using the "Inspect" tool in your browser and setting up the CSS right. For this particular issue I discovered the first column has been hard-wired to be 25% the width of the panel, so I changed that with User CSS to be 50% with
.GBDUI2DCFXB {
width: 50% !important;
}
But unfortunately that "GBDUI2DCFXB" identifier is unreliable, in another install I have it is something different. Also, I haven't been able to get setting the font size here to work, even with "!important".