Main.dart - Cannot edit in read-only editor

Hey community!

Disclaimer: I am total newbie, so it's probably an easy fix!

I am trying to modify the main.dart file of my project but it says: "cannot edit in read-only editor"

I have no idea what to do to switch to editing mode. The top right button only has "cancel" button which does nothing once pressed. "save" is greyed out and there is the middle one that only duplicates the Chrome tab.

What should I do? I would like to configure my app with the following line:

android:usesCleartextTraffic="true"
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