Why does my computer look the same? I reinstalled the operating system.

My mid-2012 Macbook Air has been running a bit slow, and I've had problems with other things, too. So I decided to reinstall the operating system and start from scratch.
But after restarting my computer in rescue mode, everything is the same. I backed up my documents and photos and fully expected my computer to look like it did when it was brand new. So this is very confusing for me.
I clicked the button for reinstall. Why wasn't everything wiped clean?
Also, the fan is running loud since the install. It's been maybe seven minutes. Why would that be happening?
Thanks.

Thank you for the help. Much appreciated.
The only confusing part was not quite knowing which option to select for the erase. Three different options appear in the left sidebar. One said something like Mac Hardware, so after some hesitation I chose that one. I wish there was a blurb that helped people understand what these are, in case they end up chosing the wrong one and permanently damaging their computer.
But it looks like I chose the right one, thank goodness. My computer is noticeably faster now because of the erase and reinstall.
Cheers.

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Message was edited by: Shiwen
Message was edited by: Shiwen

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tt2

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