Hello @vigneshvicky19, welcome to the forum!
It appears you are trying to edit the dev tools console. This is only for the webview and does not affect your repl. What you want to do is find the + button.
Theb you want to find the console or shell option.
It should open a new tab that you can drag around the editor to position where you want.
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If you click to the right of that arrow (>), you should be able to type and some buttons should appear. Click the ‘execute’ button once done to run the code you input.