@abdulr697

I dont think you can customise to Remove the Case details panel.  there is an option to collapse it but there currently there is no option to remove as. 

As constellation architecture, despite uses Harness, doesnt use sections to render the UI, there is no possibility of customizing it. 

Though not recommended, you can alternatively try to include a custom StyleSheet script that can update the CSS for the div elements on the HTML section with 'display: None' 

This is a long shot approach but no guarantee as it'd be challenging to find the appropriate class name assocaited for the case details item