How to rotate TSL flags onscreen

There is an undocumented feature will all versions of track safety PC software. When on the TRACK SETUP screen placing TSLs into position on the track map background image, right click the TSL and the TSL image will rotate 90 degrees onscreen. Right click the image again and the TSL rotates back to the original upright position.

Convenient when the TSL is mounted horizontal ontrack and you want the screen to reflect this.