Set the zoom ratio when scrolling and holding down the wheel. Enter a decimal value. Increase the value to zoom more with a single mouse click. The default value is
This advanced option is user specific and the setting is saved in options.bin under the user folder, for example, in C:\Users\<user>\AppData\Local\Trimble\Tekla Structures\<version>\UserSettings. Restart Tekla Structures to activate the new value.