How to have seperate screen time settings for different devices using the same apple id

My iPad and iPhone are using the same Apple ID and I need screen time restrictions on the iPhone but not iPad. I tried to turn off share across devices to prevent the restrictions from syncing up but they still sync and I can’t seem to prevent it. I also have a hunch that the screen time restrictions set using the family sharing feature cause the issue, but does anyone know why the two devices will keep syncing? And if its the family sharing feature causing the issue, is there a way to fix it without setting screen time separately on each of the two devices?