Hi, thanks for your interest in the game!
Have you tried not setting your game to 150% scale? And what happens if you set it to 100% and then starting it?
What do you mean by "you scroll horizontally"? How are you doing that? The only time you should be able to scroll around the screen is on the desk and only while being zoomed in.
If you only have your normal laptop monitor connect and set to 100% it should theoretically work.