I am trying to Customize/Style the Column headers in SPO but can't able to do it modern UI. I Don't want do DOM Manipulation(since the classes can be changed at any time) but wanted to see if there's an alternative way where I can customize and introduce fluent UI icons into the column headers. Any help is appreciated.
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To my understanding, this is currently not possible. The closest thing that comes to this would be custom view formatting. Here you can actually modify the OOTB header... but only hide it! Views allow you to build your own header, but this would not be able to leverage the custom logic currently in place (drop-down to sort/filter/etc.)

m1g
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Another option, you can use SPFX to inject CSS/js file to customize the list header.
SPFx Applications Customiser CSS Injection

Amos
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