A multi-root workspace puts several folders into one VS Code window. Multiple windows give each folder or workspace its own editor instance. Choose according to how tightly the repositories must work together.
Use multi-root for one combined change
Add folders to one workspace when a change routinely spans related repositories, such as product code and its documentation. VS Code can search across roots, show multiple source-control repositories, define global workspace settings, and preserve the folder set in a .code-workspace file. Folder names can be customized to disambiguate similar files.
The tradeoff is shared editor-wide context. VS Code notes that some editor-wide folder settings are ignored in multi-root workspaces, while workspace settings apply across the set. Search results, tasks, debug configurations, and extensions require deliberate folder scope.
Use separate windows for independent contexts
Choose separate windows when projects have different environments, extension expectations, trust boundaries, or display roles. A clear window title and terminal working directory reduce accidental commands in the wrong repository. Separate windows also let one project remain visible while another occupies full screen.
Test the failure you want to prevent
If cross-repository navigation dominates, multi-root reduces switching. If context contamination dominates, windows improve isolation. Wallo can group multiple VS Code windows with a goal, but it cannot inspect roots or prevent a window from later loading a different workspace.