Or do you need to install everything you asked for in the instructions?
Yes, they need to install everything from the manual.
the clear text field does not work properly if there is a line break
This action was made through the long swiping between start and end points of the text field. This makes the text stand out. After that the "DEL" command is executed. So you can try to run this actions step by step:Clear text. Send 1 or 2 "DEL" actions ("Send Key Event" with code 67). This will remove the empty first line. Clear text again.