If you are new to using Dynamics 365 and if you are looking to check how much storage is being utilized in Dynamics 365, here’s how you can check it –

Power Platform Admin Center

Here’s how you check the storage utilization of your Dynamics 365 / Dataverse instances in your tenant –

1. Provided you have the right access, navigate to the Power Platform Admin Center (https://admin.powerplatform.microsoft.com/environments)
   Now, expand the Resources section which would be collapsed as pointed in the screenshot below.
   
   
2. Under Resources, you’ll find Capacity section under the same.
   
   
3. When in Capacity, you’ll see Dataverse section. Although, you’ll still find the summary but not in detailed numbers.
   
   
   
4. In Dataverse section, you’ll see the list of you Dataverse / Dynamics 365 CRM instances listed and having a summary of their current storage utilization. You can click on the graph icon to further drill down into the details.
   
   
5. Let’s say – I’m into CFT158 environment, so – I’ll see all the details of that environment.
   Also, notice the hamburger menu on the top left.
   
   
6. Clicking on the hamburger menu, you’ll see some options which you can use to view/get this data.
   One important one is to get the details of all the tables (Since only top 10 tables are listed in the view you see)
   
   
7. Let’s say you clicked on Downloaded all tables as shown in the screenshot above, a CSV file will be exported on your system and will contain all the tables’ storage utilization and not just top 10 tables.
   
   
8. Also, here’s a Microsoft Docs link on detailed explanation of how you can utilize the Storage details – https://docs.microsoft.com/en-gb/power-platform/admin/legacy-capacity-storage#environment-capacity-analytics?WT.mc_id=DX-MVP-5003911
   
   

Hope this was helpful! Here are some more Dynamics 365 posts which you might be interested in –

1. Use Hierarchy in Roll Up Fields in Dynamics 365 CRM
2. Filter records in a View owned by a Team you are a member of | Dynamics 365 CRM
3. Get GUID of the current View in Dynamics 365 CRM JS from ribbon button | Ribbon Workbench
4. Dynamics 365 App For Outlook missing on SiteMap in CRM? Use shortcut link [Quick Tip]
5. Import lookup referencing records together in Dynamics 365 CRM | [Linking related entity data during Excel Import]
6. Mailbox Alerts Hide/Show behavior in Dynamics 365 CRM
7. Excel Importing Notes (Annotation) entity in Dynamics 365 CRM
8. Enable/Disable the need to Approve Email for Mailboxes in Dynamics 365 CRM CE
9. Call Azure Function from Dynamics 365 CRM using Webhooks
10. Show Ribbon button only on record selection in Dynamics CRM
11. Accessing multiple occurrences of a field in Business Process Flow using JS in D365 CRM

Thank you!!