I’d love to see this as well, especially since I often have the dev tools open.
As a workaround you could create a user style (e.g. via the Stylus extension) that reserves some fixed space on the left side:
.w-100.mw8.ph3.center.mt4 {
padding-left: 10rem;
}
By the way, is there any chance to have semantic classes added to the UI?