Override an Existing Page with a Visualforce Page

Create a Visualforce page called TabbedAccount.

1<apex:page standardController="Account" showHeader="true" tabStyle="account" >
2    <style>
3        .activeTab {background-color: #236FBD; color:white; 
4             background-image:none}
5        .inactiveTab { background-color: lightgrey; color:black; 
6            background-image:none}
7    </style>
8    <apex:tabPanel switchType="client" selectedTab="tabdetails" 
9        id="AccountTabPanel" tabClass="activeTab" 
10        inactiveTabClass="inactiveTab">
11        <apex:tab label="Details" name="AccDetails" id="tabdetails">
12            <apex:detail relatedList="false" title="true"/>
13        </apex:tab>
14        <apex:tab label="Contacts" name="Contacts" 
15            id="tabContact">
16            <apex:relatedList subject="{!account}" list="contacts" />
17        </apex:tab>
18        <apex:tab label="Opportunities" name="Opportunities" 
19            id="tabOpp">
20            <apex:relatedList subject="{!account}" list="opportunities" />
21        </apex:tab>
22        <apex:tab label="Open Activities" name="OpenActivities" 
23            id="tabOpenAct">
24            <apex:relatedList subject="{!account}" list="OpenActivities" />
25        </apex:tab>
26        <apex:tab label="Notes and Attachments" name="NotesAndAttachments" 
27            id="tabNoteAtt">
28            <apex:relatedList subject="{!account}" list="CombinedAttachments" />
29        </apex:tab>
30    </apex:tabPanel>
31</apex:page>

The <style> tag is an HTML element, not a Visualforce component. It defines the CSS classes for two types of tabs: activeTab and inactiveTab.
The <apex:tabPanel> component generates tabs.
- Its tabClass attribute specifies the CSS class used when a tab is active.
- Its inactiveTabClass attribute specifies the CSS class used when a tab is inactive.
Each child <apex:tab> component within the <apex:tabPanel> component represents a tab with different information about the account.
- The first tab uses the <apex:detail> tag to show the account’s details.
- The other tabs use the <apex:relatedList> tag to show lists of records related to the account.

To preview the TabbedAccount page, specify the ID of a particular account in the URL, for example, https://MyDomain_login_URL/apex/TabbedAccount?id=001D000000IRt53.

Override the standard Account detail page with the TabbedAccount page.

From the object management settings for accounts, click Buttons, Links, and Actions.
From the list, find View, which represents the detail page of an account record. To override this page, click Edit from the dropdown menu.
In the Salesforce Classic Override section, select Visualforce page as the override type, and then select TabbedAccount from the dropdown menu.
To apply the TabbedAccount page in Lightning Experience or the Salesforce mobile app, select Use the Salesforce Classic override.
Save your changes.

On the Accounts tab, select any account record. The record detail page is now TabbedAccount.

Visualforce Developer Guide

See Also