To use the flutter commands in any IDE in windows you need to add the flutter SDK to the windows environements. To do so just follow the simple steps below:
- Right click on the computer icon in desktop (make sure its not a shortcut) and select properties.

On the left side of the new opened window click on Advanced system settings.
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Now in the system properties window that opens select Environment Variables.

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In the new window double click on path to open a new window.

- In the new window opened click on New and paste the path of the bin folder located in the flutter sdk folder. For example my path is this:
D:\FlutterSDK\flutter\bin
Note: It doesn’t matter where you want to place the flutter SDK, just copy and paste the path of the bin folder here.

- Click OK, OK, OK.
Now you’re all set. Try restarting the IDE or even better restart the PC.