Welcome to the forums, Alan

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Can you please check that you are running the correct resolution for your monitor please. Right Click the desktop, then click "Display Settings" - it looks like you've already checked here, but did you take a look at the resolution dropdown?
If you let us know your monitor (or laptop) model, we can check the correct resolution for you. Normally Windows guesses correctly and assigns the "recommended" resolution, but what you are describing makes it sound like this setting is incorrect.