XS_ZOOM_STEP_RATIO_IN_MOUSEWHEEL_MODE
Category
Model View
Set the zoom ratio when you are scrolling using the middle mouse button. Enter a decimal value. Increase the value to zoom more with a single mouse click. The default value is 0.05
This advanced option is user specific and the setting is saved in options.bin under user folder. Restart Tekla Structures to activate the new value.