The Contact relationship page can now be embedded into the company detail page by editing the Company layouts.
1. From Setup, use the Quick Find to search for and open Object Manager. Open the Company/Account object. Edit any page layouts that you would like to have the Contact Relationships piece on the page.
2. Create a new section by dragging the Section item from the top bar onto the page and setting the following properties.
3. Choose Visualforce Pages in the top bar, and drag the ContactRelationships page into the section that you just created.
4. Click on the wrench icon on the new item and set the following properties: