I'm struggling with this one too.
I have an official touchscreen. I have written a script, which runs a tkinter graphics window. Once selections have been made in the window, the tkinter bit shuts down, and then calls a python 3 script. This script runs in terminal, and the terminal window is too big to fit on the touchscreen.
So far I have tried,
Right-click on terminal title bar and resize. This works, but only when that program is running. If I shut it all down and restart the tkinter program, my selected terminal size has been forgotten.
Editing lxterminal.desktop and edited
Actually, I added only the --geometry bit.
This works when clicking on the lxterminal desktop icon, but when my python script launches, the terminal window is too big again.
How can I save this terminal window size, permanently?