Should boys and girls be allowed to use the same toilets in school?

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So I have an 8 year old daughter. It’s recently come to my attention that her year and upwards in her school, have boys and girls use the same toilets. My first reaction was shock because i am pretty sure I never had to when I was a kid. As well as that, there’s the fact that you just don’t know what goes on in the toilets. Boys/girls could be peeking under cubicles, or leaving doors open and god forbid showing there “bits”. So am I crazy in thinking that this isn’t right? I’ve spoken to a few other mums and, like myself they had no idea that this was a thing? I don’t know whether I’m being an overprotective parent or whether I should speak to the head teacher about it. Any advice is welcome. I am new to this also, so be nice :)