A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You have not done anything to alter the Ribbon. You cannot do anything to alter the Ribbon. It makes its own decisions. It is always in its "default" setting. It makes the most of the space available to it [the combination of window size & display resolution].
This is the Excel 2007 Ribbon on my 1366x768 computer, window maximised
This is the Excel 2007 Ribbon on my 1920x1200 computer, window maximised
Both Excel 2007s have exactly the same Excel Options. There is no difference between them other than the monitor they work with.
This is the Excel 2007 Ribbon on my 1920x1200 computer in a window that is smaller than maximised
The only way to alter an Office 2007 Ribbon's contents to suit your preferences is by building a CustomUI as an add-in.
If you ever upgrade to Office 2016 then you will find that the Ribbon can be Customised in Excel Options - you can see that entry on the left in Bernard's screenshot. Here is a shot of its dialog.
You can change which Ribbon tabs appear and you can change which controls appear on each tab [these choices were first introduced with Office 2013, I believe]. But if, like me, you want to hang on to Office 2007 until it falls out of support next year, then the Ribbon is a law unto itself as far as we are concerned.
And that other post about setting Options - you are correct about our Options being set up differently and that post was also irrelevant; the poster thought you wanted to change the display theme and that is not relevant to your actual question. As Excel 2007 users, we can change Excel Options, Popular, Colour scheme between Blue, Silver & Black. Your present Colour scheme is Black and the Colour scheme of the Excel in the screenshots you added are Blue. Excel 2016 has more choices when it comes to colour schemes. But as I say, this is not the point of your question.