Btw, Check out this cool video: How I Made A Laptop From Scratch - anyon_e
There is a draw.io extension for VS Code (like another comment mentioned, it looks like the main application is vs code), and the UI elements inside the open tab with grid looks like draw.io’s minimalistic dark theme.
Edit: yeah looks like it: https://marketplace.visualstudio.com/items?itemName=hediet.vscode-drawio
The screenshot you have in your post just has a different drawio theme than the default one. You can change the theme in settings of drawio.
Edit 2: Scrap that, it was proved to be obsidian based on LordeMostarda’s comment and answers below
This feature is called canvas, you can create one by clicking in this button
Is that vs code with a graphviz/dot plugin?
This is from that home-built laptop video? I was wondering the same.
Was also wondering about the “schematic editor”, which I think might be kicad.
That is either obsidian or logseq with a really really good theme