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Excel is much more limited in the browser compared to the desktop app.

Conditional formatting for example can not use formulas in the online version.

The browser version is good but it's not at the same level as the desktop or even Google sheets yet.

See https://docs.microsoft.com/en-us/office365/servicedescriptio...

When you see a footnote next to a 'Yes' in the online version, read it as a 'No for 90% of use cases'.

In Office 365 Excel, there is no way to zoom out or in besides the browser's zoom which causes the whole UI to be scaled.

You may want to look in their uservoice forums to see how requested that feature is, and upvote it. I've seen a few of the features I've requested and supported bear fruit from this.