Hi Dan,
Thanks for contacting Syncfusion forums.
Query:” Is there a simple way to get rid of the free space at the left and right of the grid's layout (see attachment)”
We do not apply any styles to occupy /display the excess white space around the Grid. So we suggest you to modify your layout page and remove any external css (site.css) files referred or applied to that page.
Please get back to us if you are facing any difficulties while implementing this.
Regards,
Vignesh Natarajan.