It let’s me continue as a guy too but I wanted to restart it because I didn’t remember anything of the story and it outright makes the main character a girl. I played a bit to see if they moved the option further in the story and still no way to change it. In the old version it immediately gave you the choice as soon as the episode started but here it seems it’s nowhere to be seen, specially since the room already starts as the one the girl choice had.
It could be a bug but since the MC immediatly starts as the blonde girl in the cover I wouldn’t be surprised if they outright removed it so it would look like the one in the art.