A simple application that displays which desktop space is currently focused, like many Linux distributions.
Dark Mode
Light Mode
Download zip file from latest release: Releases
After downloading, unzip and place application in /Applications.
I haven't gotten it signed yet, so you also have to go to System Preferences and allow apps from all developers.
Optional: Add as a login item for your user in System Preferences to open on startup.
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When changing the order of desktop spaces, macos-spaces can take several minutes to recognize that a change in the order has taken place
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Multi-monitor support may or may not work
Thanks to: WhichSpace, for demonstrating how to observe when dark mode is switched to light mode and vice-versa.