What's ok and not OK at supervised visits?

Hey IM's
Just wondering if I'm being too over the top at the visits her dad lets her climb on a fence. fenced play area and he's made comments about taking her so I asked him to take her down from the fence. He goes I'm parenting so I say it's fine. He undermines anything I say. Due to him going inside I followed but sat on seats behind. He turns to our child and goes come on let's go outside and play away from mum. Who says that to a nearly 4 year old! I wasn't interfering just being close by die to him saying to her that was daddy's chance to take her when I didn't let her go to his car. He's made comments like this numerous times. He also this visit and last asked her to go sit in the play area with him and got her to take the food and stuff in. I don't say much I just sit there unless it's something that I need to say. Like she had surgery on her head and he held her upside down for ages. After a bit he wasn't stopping I said you really shouldn't be doing that she still hasn't gotten the all clear. He goes I was waiting for you to say something and goes to our daughter mummy said no. After the last visit and him sitting up in the play equipment with her she was unsettle for around 3 days. She disclosed the night after that daddy said he was going to take her somewhere and daddy told her not to tell. She kept saying she was scared and I asked why? I said you can tell mummy anything you won't be in trouble and she came out with that. I said daddy's not taking you baby girl and you can always tell mummy anything we don't keep secrets. Than after that the morning she also repeated similar things. There's DV orders on both us. It's always in a public place. My concern is what he is saying to her obviously these things but in ear shot he also tells her she can go to his house soon and feed the horses next door. She's not going unsupervised drugs, dui, DV us and previous, manslaughter, etc and she has no concept of soon so she now uses the word soon but doesn't understand when soon is. Telling her something like that empty promises really aren't in her best interests. She never asks these things he always tells her. Also she doesn't ask to go sit in the equipment he turned to her and said lets go sit up in there.
I don't know if im being too concerned. He said to her I'll walk you to mummies car I said no say bye to daddy here. He goes no I'll do what I want there aren't any orders in place. There's No need for him to come to my car and I really don't see the need for it.
I doubt myself so much. He gives me looks at the visits which these days don't intimate me as much as they used to and I think becuase he's loosing control of me and things he's now using our daughter. He's never bothered much and he's never bought up his other kids. I'm worried. I'm worried he will try to get her unsupervised. There are 4 other ex partners I'm aware about that were also abused by him. I didn't realise the extent till recently except for two which I believed what he said but I now know better. I don't want to stop visits as that's not fair on her but I also don't want her going into his world thinking all the things he does are normal. He's cunning, charming, knows what he needs to do when he wants something, knew what to say to the councillor when he got out so he didn't have to keep attending. I don't want him doing damage to her mentally. I'm wanting to protect her from all that.

I'm just wanting to know what is and isn't ok at visits? At what point am I ok to say something? I don't want to prohibit visits as this will go against me in court and I also think she still needs to see him for her own well being but I also don't want him saying things to a nearly 4 year old. I never say anything like that. Only ask him to stop doing things that I think are reasonable to ask to be stopped. If I was there not on a visit I would tell her to stop the exact same things.

Thanks for you input