Call the shots/tune
Definition 1 of 2
Pro Tip 1/3Authority Signifier
Indicates who is in charge or has the power in a situation. 
During the game, the coach calls the shots, not the players.
Pro Tip 2/3Responsibility Implication
Suggests the person making decisions also bears the responsibility for the outcomes. 
As project manager, you'll call the shots and handle any issues that arise.
Pro Tip 3/3Power Dynamics
Used to discuss who has more power or say in a group or situation. 
In their partnership, it's generally Jane who calls the shots.