To save formatting from an ad hoc grid:
In the Save Grid As dialog box, select the Submit Formatting option when saving the ad hoc grid as a form.
You can now open the saved form and choose a viewing option as described in Viewing Formatting in Smart View.
Related Topics:
Saving Excel Formatting on a Planning Form
Viewing Formatting in Smart View
Supported Native Excel Formatting
Guidelines for Working with Native Excel Formatting and Planning Forms