It's not recommended to make changes to code, as we have a plugin system for making modifications. Even so, we don't do anything to prevent it. In 7.10 we removed the optimizer in production entirely, so not sure the thing you're modifying was migrated off of that but still somehow reflected in those legacy build outputs. What file are you modifying?
@RichaSinha08 for #1, the Kibana share functionality changed in 7.9 to give you more options, one of which is hiding the top menu that contained the share and edit buttons.
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