It would be really awesome if you could introduce a sticky datagrid header that stays in place when you scroll up and down but also follows the data if you scroll left to right.
I implemented a working solution in Mendix 7.23.4 using custom jQuery with an HTML snippet however with the datagrid changes in Mendix 8.6.4 it no longer functions properly due to the DOM changes.
With the future datagrid in Mendix 9 it appears the DOM structure will change again. I hope you will consider building this feature into Mendix.
Thank you!!