To Configure Conversations/Conversations View on Classic, follow the below steps:

• Login to Salesforce using the following page:

• To login, enter the Username and Password in respective fields and click Login In button. 
• The following SMS-Magic Converse Home page appears:

• On the top menu bar, click on Contacts

• The Contacts Home page appears as shown below:

• Click on any contact, the following page will appear:

• Click on the Edit Layout option, as highlighted in the above image in red. 

• The following contact layout page will appear:

• As highlighted in red, select the Visualforce Pages option to continue. The following options will appear in the Quick Find list:

• As Highlighted in the above image, select the Conversation option. Drag and drop the Conversation menu in any space on the page. 

• The Conversation box will appear as shown below:

• Click on the Properties option on the top right corner as shown below:

• The following properties window will appear:

• For better usability, increase the height to 450 or 500 and click on the OK button

• Click on the Save button to save the properties, as shown below:

• After saving, the Conversations component will be visible as shown below:

Here, you will be able to see the record-specific conversation details in a single window.