No, it is not. You will need to use the space you have efficiently. How come this is a problem?

You can increase the size of the window by going into settings (checkmark at the bottom right) and setting the "window scale factor" to a larger number, such as 2 or 3, depending on the size of your screen. This only changes the resolution, not the size of the sandbox itself in terms of particles.

@Jakav, i think they mean the windows size, if its so then yes it can be made bigger but i forgot how, if u mean add more pixels to the game itself then its not possible

That was the conclusion I came to after reading RebMiami's post. RebMiami already explained how to change window size.