@Anonymous - The flows should be listed under "My Flows" or "Team Flows". If they are under Team Flows and there are multiple owners (users or Office 365 Group), then these owners can update the flow.
If there is a System Admin for Power Automate that can access the Power Automate Admin Center (https://admin.flow.microsoft.com/), they can see all flows in any environment. They can also turn on/off flows.
Another thing to review are your DLP (Data Loss Prevention) policies in the Power Platform Admin Center (https://admin.powerapps.com/apiPolicies). You can set up policies that govern which connectors can be used or not, and for which environments.
Also, note that this differs from trigger to trigger. For example,
1. If you use a Power Apps control to trigger the flow, it will consider the current logged in users connection for all the actions.
2. If you use a manual trigger and share the flow, you can configure whose connection the actions in the flow should be using and etc.
Hope this Helps!
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