You can adjust the corners afterwards.
Select a Tile Series and Color, then drag your mouse across the floor to paint specific tiles.
Click on edging to remove, or Shift + Click to remove the entire line.
Hover over the ends or turns of an LED strip and click to place or remove a corner block (3.5cm × 3.5cm). Click Done when finished.
Click on the grid lines between tiles to place or remove LED strip segments (3.5cm × 40cm).