You can change the properties of a square in the grid by moving the cursor onto the square and pressing Alt+Enter or clicking on the properties icon () on the toolbar. You can change the properties of many squares at once by first selecting a number of squares in the grid (or use one of the Select All options on the Edit menu).
The left-hand side of the dialog box shows a preview of what the square looks like in the puzzle and in the solution.
Square Type
This shows the type of the square. Click on one of the buttons to change the square type.
Format
Change these settings to determine the background and letter color of the square. The options available depend on the type of square whose properties you are changing. The default colors for blocks and letters are set in the Grid Properties dialog box, change these if you want to change the settings for all the squares. If you select the Custom item from the drop-down color lists you will be presented with a color selection window to select any color of your choice. Check the Circle box to have a background circle of the given color rather than coloring the entire square.
Click the background picture button to insert an image file to use as a background for the square. If the square is a letter square you can check the Rebus box to make the background image show only in the solution, to have the square blank in the puzzle, but to have Display Letters that give the letters for the rebus. (e.g. you might insert a picture of a cross to replace the display letters 'cross').
Formats in solution, Formats in Puzzle
These options determine whether the colors and bold/italic setting you have selected are used in the solution and/or the puzzle.
Main central text
For letter squares, here you can edit the letter or letters that appear in the square. Usually a square has only one letter, but multiple letters can be useful for making rebus puzzles.
Letter visible in puzzle
Check this option to make any letter in the square appear both in the puzzle and the solution. This is useful if you want to give some the solution letter to some of the squares in the puzzle as a starting hint.
The default numbering follows the setting in Grid Properties. Check No across clue or No down clue if for some reason you don't want to have any clue associated with the given word. The square will not be numbered if no clue starts at that square. Set the Top left text (after unchecking Default numbering) to specify a custom square number, or Top right text to have an additional number (or other text) at the top right of the square.
Select this option to hide all contents of the square in the puzzle. This is useful for creating skeleton crosswords where people have to fill in the blocks and numbers as well as solve the clues.