The RCMP, reports of the Country of Canada (https://en.wikipedia.org/wiki/Royal_Canadian_Mounted_Police). And the RCMP is "a police service for the whole of Canada to be used in the enforcement of the laws of the Dominion, but at the same time available for the enforcement of law generally in such provinces as may desire to employ its services."
The most important part is the RCMP enforcement in provinces is at the DESIRE of the provinces, in this case The Ontario Provincial Government.
Additionally regardless of formal "powers", no legitimate leader in any democratic govt wants to be seen "giving orders" to police forces -- that's entirely outside of democratic norms.
The federal govt sets standards and expectations and framework for the RCMP. It should not, and does not (hopefully), tell them what to do on specific case files.
RCMP
Minister responsible Dominic LeBlanc, Minister of Public Safety
How a Canadian doesn’t know the structure of their federal government is beyond me.