Yes, just increase gui.subtitle_maxwidth to the length you want
Viewing post in Anime Subtitles in Ren'Py comments
The max number that would make sense is the width of your game window (so 1920 for a 1080p game).
The layout is in "subtitle" mode which tries to even out the length of each line. If you want the default back just delete the part that says layout "subtitle". But note that this can be annoying to read because it will make the top line closer to the max width meaning you have to move your eyes more.