You must have seen Security Roles, Field Level Security, Access Teams etc. as a way to access records in Dynamics 365 CE (or CRM). Here’s what Hierarchy Security is all about –

There are 2 types of Hierarchy Settings in Dynamics 365 CE and what they mean in a short explanation –

1. Manager Hierarchy – Access control of records based on the Manager settings for a System User.
2. Position Hierarchy – Access control of records based on the Position of the System Users based on how they are placed in the Organization.

Configure Hierarchy Settings in Power Platform Admin Center

Given that you have Dynamics 365 Admin privileges, you can configure the Hierarchy Settings as below –

1. Go to the Environment’s Settings in Power Platform Admin Center
   
   
2. Now, you can expand and click on Hierarchy Settings
   
   
3. By default, these will be Disabled by default. Then, you can turn on the one which you want and configure the same.
   
   
4. In order to Configure the Manager Hierarchy Model, you can refer this post below –
   Manager Hierarchy Settings in Dynamics 365 CE
   
5. In order to Configure the Position Hierarchy Model, you can refer this post below –
   Position Hierarchy Settings in Dynamics 365 CE

Hope this was useful!

Thank you!