I tried to override wishlist view.phtml which loaded at customer account page like this:
app/code/Test/Salesman/view/frontend/layout/wishlist_index_index.xml
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<referenceBlock name="customer.wishlist">
<action method="setTemplate">
<argument name="template" xsi:type="string">Test_Salesman::wishlist/view.phtml </argument>
</action>
</referenceBlock>
</page>
app/code/Test/Salesman/view/frontend/templates/wishlist/view.phtml
<h1> SUCCESS </h1>
but it always shows the original phtml file