Small dual screen with liveview setup advice

I’m on a fieldwork job with a tabletop setup in the corner of a storeroom to photograph small objects. I’m working teathered. I have a wired trigger for the shutter release, so the only thing that I’m using the live view window for is manual focus, and framing. I’m on a 15 inch 1080p laptop with an external 4k Lilliput 12 inch screen as a second display for laptop.

I would like to set the external display to be a full screen (or almost full screen) viewer so that I maximise how much I can see on the 12 inch, (but very sharp) screen; aspect ratio of external screen means I have a little space down the side of it, so could fit either “tools” or “browser”, but not both. I would then like to place the other panel (browser/tools) on the main laptop display with the liveview window. However, I can’t find a way to configure it like this.

The “Dual monitor – large viewer” workspace gets close, but the main window ends up filling most of the laptop screen with an unnecessarily huge browser.

Even getting one of the “tools” or “browser” detached and floating would be good enough. While there is a “floating tool” option, I don’t think it can have tabs, and I’d have to recreate the whole “tools” panel from scratch which would be a lot of work. A floating “browser” would be perfect. Being able to dock the browser to the liveview window would be even better.

A long term answer could be to get a third display ~10 inches – and wire it right to the hdmi out of the camera, but I’m not sure that’s needed.

If anyone has any ideals (especially quick ones given I’m already here and working!) I would appreciate your thoughts.

(edit: formatting)