There are several options to control if and how diagonals will be used to place words in the grid:
First of all, you can disable diagonals completely,
Second, you can limit the number of diagonals,
Finally, you can use only the easiest diagonal direction.
How to Enable or Disable Diagonals in your word search puzzle
By default there will be no diagonals used in your word search puzzle, only horizontal or vertical words. To enable Diagonals, make sure the “Diagonal” checkbox on the “Puzzle” tab is checked:
How to Limit the Number of Diagonals in your Word Search Puzzle
You can set the maximum number of diagonals in your word search puzzle. Since the direction of each word is determined randomly, this maximum number may not be reached for each puzzle.
How to Use only Kid's Diagonals in your Word Search Puzzle
To create word search puzzles that are easier to solve, for example for Kids’ activity books, you can select “Kid’s Diagonal”. This will only enable diagonals that go from top left to bottom right, the normal reading direction. In this example, the “Kid’s Diagonal” limits the direction, and “Limit Diagonals” limits the number of diagonals in your puzzle.