upload module attachment settings question

Hi, wondering where the settings are for upload.

I'm trying to only allow one upload per node but I don't see any settings to allow that anywhere and I can't find anything about it on the search here.

Also, once you upload a file attachment, everyone sees that list option, I can see in the future getting asked what is that alot so how do I remove it from being show except to admins?

I tried to use css to hide the button but then the upload progress won't work so trying to keep that there.

Any help would be great since I tried to look at all the settings and don't have a clue where to begin for this.