you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. It sounds like it may have gotten shrunk at some point but it's fairly easy to get it back into full screen. To do this you'll want to click on Quicken to make sure it's your selected window. Then once it's selected on your keyboard hold the Windows key and press up on the Arrow pad. You may need to do it a couple times for it to cycle to be full screen but it'll pop up in only a couple of tries at most.
let us know if this helps resolve the issue for you.
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