When you edit a grid as much information is shown as possible as regards square colors and settings. Use the Puzzle and Solution buttons on the toolbar to preview what the puzzle and solution will look like. You can also select View from the Grid menu, where you can also choose whether to show numbers when editing the grid.
Some square properties depend on whether it is the solution or puzzle that is being viewed, so it is a good idea to use the view feature to make sure everything works correctly in both views. To change whether a picture is shown in the solution right-click on the picture. To change whether clue squares are shown in the solution see Grid Properties.