If you have created a grid, you might want to have certain columns sortable, searchable, change labels etc. To do so, select your grid and find the fields property. Open the property editor by clicking on the small button.



The property editor contains all the fields on the grid. Clicking on each field shows the properties for that field. Change them in the property editor, here 'sortable'. 



After generating and run the form shows that the field is sortable:



Other options are 'searchable', which will make the field searchable for the search bar in the grid. Title and title align for the column headers etc.