atari st screen size is tiny?

[markspeaking]

Managed to get .st files to work with emulatorjs on windows chrome/edge, with the tos file located on my own server, but the java screen opens with just a quater of the screen, dead oin the center showing the St dektop, almost unreadable and havent found an option to exp-and full size. full screen only expand the java screen, i still get only a quarter of the atri desktop screen size? any settings that can be used in scripts? any help appreciated