The ChatGPT app has two window modes: A full experience that looks like the website, and the "quick input" that looks like this Google Bar, which comes up with aforementioned keyboard shortcut.

Thanks, I found a page on their site that goes over this: https://help.openai.com/en/articles/9982051-using-the-chatgp...

I still think that the Google Windows program looks more like Apple Spotlight than the ChatGPT companion window pictured there though.