I know how to make a empty line!
A registry setting is required.
HKEY_CURRENT_USER/Control Panel/Input Method
Create string parameter EnableHexNumpad =1. Type REG_SZ.
Reload.
At desired location:
Press and hold the Alt key.
Press the + (plus) key on the numeric keypad.
Enter the value 3164 on the numeric keypad.
Release the Alt key.
You have a empty line
Then you can copy this invisible symbol and paste as many times as you want.
By these actions I insert the invisible character UNICODE "U-3164", which is not empty, unlike the space bar.
I hope that the developer will automate this process and add it to the program menu.