You would need to edit the SCSS files in the custom folder of your app.
When you use the browser inspect mode, you can find out which class is used to set the color of the selected data grid row.
Then copy the CSS selectors and add that in the _custom.scss file.
Then you would need Mendix Calypso or another SASS compiler to compile the SASS into CSS.
Then you can rerun your app and you should be able to see changes.
Hope this helps.
Hi Jeffrey – what do you mean by “browser inspect mode”? Thanks