I have added below code in `VendorName/ModuleName/view/frontend/layout/customer_account.xml`.

Also tried changing in VendorName/ModuleName/view/frontend/layout/default.xml

But none of these are working.

What could be the issue?

```
<page layout="3columns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">

```