All Excel options are greyed out
<p>I found an Excel document on reddit that I am attempting to edit to suit my needs. I am having issues with it and went in to the options to change some settings. Everything is greyed out and cannot be changed. I have checked the file to make sure that it is not read only. I am as admin on the computer and, as far as I can see, have permissions for the file. I have tried closing and reopening, as well as restarting the computer. Is there something obvious that I am missing? Or does anyone know how I can fix this so that I can keep editing the file?</p>

<p><a href="https://i.stack.imgur.com/w4BE3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/w4BE3.png" alt="enter image description here"></a></p>