Hi, help, I can't manage to change the name.

Hi , 

Ensure that you're working in the Lightning App Builder and editing the correct page layout for the Account object.

Upgrade to Dynamic Forms

When you click on the Record Detail component and select Upgrade Now, make sure the page is upgraded to use dynamic forms. Without this step, you won't see the option to customize field sections.

Add the Field Section

Drag the Field Section component from the palette to the desired spot in the Details tab. After adding it:

• Click on the new section.
• In the properties pane, type "Sales Region" in the Label field. You don’t need to "find" it in a list—it’s just a text input.

Save and Activate

After customizing, click Save, and if required, activate the page for the right app or profile.