I've looked everywhere but I can't find the solution. How can I remove the 'this window' tab from my environment? I want to close it.
Edit : Make sure you are using a mouse with right-click capability.
Right click on the tab and choose Delete
If the popup doesn't appear then there is something wrong with your installation or this is a bug.
You might try resetting Blender to factory settings or there is a hidden feature I do not know in the preferences to disable it...
To reset to factory settings (Caution this will revert every setting you changed after the installation)