A frontend extension for ComfyUI that allows you to open and edit subgraphs in a right-hand panel, instead of replacing the main canvas.
https://github.com/nomadoor/ComfyUI-DualPanel-Subgraph-Viewer
git clone https://github.com/nomadoor/ComfyUI-DualPanel-Subgraph-Viewer
comfy node install dualpanel-subgraph-viewer