Starting from Windows 10 20H2, you won’t able to see the activation Status from “About” this PC. you could see the edition and version below, but it won’t show activation status here anymore.
To check activation status in Windows 10, select the Start button, and then select Settings > Update & Security and then select Activation. Your activation status will be listed next to Activation.
Here you go!
Ref: https://support.microsoft.com/en-us/windows/activate-windows-10-c39005d4-95ee-b91e-b399-2820fda32227#:~:text=To%20check%20activation%20status%20in,be%20listed%20next%20to%20Activation.&text=You%20are%20activated.