Use case or problem
Obsidian allows you to open multiple vaults, and every vault has it’s own operating system window. However, it’s hard to work with this set up because there’s no indicator that you have multiple windows open, or a way (menus or shortcuts) to easily switch between open windows.
Proposed solution
Add a Window menu to the menu bar that lists all the open windows. Clicking on one entry would allow you to switch between windows.
Current workaround (optional)
Visually find the windows (which can sometimes be tricky, specially if one of your vaults has its window maximized) and click on their window bar.