Microsoft designed the on-screen keyboard in Windows 10 with tablet users in mind. The large keys are easy to tap, autocorrect and text suggestion are built in and there’s an emoji button. However, the default keyboard is missing special keys, such as function keys and a number row. If you prefer a full keyboard layout or just need to use it once in a while, here’s how to access it.

To switch to the full keyboard layout, you have to turn the option on in Settings.
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https://www.laptopmag.com/articles/full-layout-touch-keyboard-windows-10