A reliable project switch has two short phases: leave a clear restart point, then verify the live context when you return. The aim is not to freeze the entire Mac. It is to preserve enough intent that the next useful action is obvious.
Leave a restart point before switching
Write one next action with a verb and completion condition. “Continue report” is weak; “compare the three source totals and resolve the mismatch” tells you where to resume. Keep only the windows needed for that action in the active project group.
Save durable material in its proper system: files in folders, webpages as bookmarks or resources, and decisions in notes. A currently open window is useful session context, but its identity can disappear when the window closes or the app restarts.
Return through the project, then the window
Choose the project before choosing an application. Inspect the group’s next action, then select the window that contains its starting material. Confirm its title, document, account, or repository path before editing.
If a window no longer exists, reopen the durable resource. Do not assume a stored window reference recreates browser state, terminal processes, unsaved documents, or exact geometry. Workspace launchers can open registered resources; window organizers find or group windows that are currently present. Check which behavior your tool actually provides.
Keep switching cost visible
After several switches, note what repeatedly goes missing. If the next action is unclear, improve task wording. If the right app opens but the window is ambiguous, improve names or grouping. If resources must be relaunched, add durable links or use a launcher. If geometry is the problem, use a layout tool.
This diagnosis keeps the system small: fix the lost layer instead of adding a second tool that manages a different object.