When you say overview dashboard, do you mean the first screen that opens by default when you go to HA? Like the default Lovelace view? Because that’s fully editable so you can show or hide whatever you want there.
Also based on your use case it seems like you might want to check out tileboard as a way to just provide a tablet or something and an interface specifically for it. Or you could check out browser mod which I believe gives you essentially full control over exactly what appears and happens when a particular device accesses ha.