If you are a Salesforce Classic user, you can simulate the Reveal Widget in your Account records by downloading the Reveal Data App.
After downloading the Reveal for Salesforce Data App
Go to your Salesforce Settings > Search for 'Page Layouts' to find the Account Page Layout section > On the 'Account Layout' page layout option, click Edit
On the left side, scroll to 'Related Lists' > Select 'Partner relationships' to enable this list
Configure the fields as follows: