The Change Record Type button is available on the Page layout, however after saving the layout, the button is not showing up on record.
Below are the steps to check the "Change Record Type" button on Page layout:
In Classic:
Click Setup | Customize | Name of the object | Page Layout
In Lightning:
Click Setup | Object Manager | Name of the Object | Page Layouts
Note: You will see the 'Change Record Type' button in Mobile and Lightning Actions and in the Buttons section.
Go to any page layout and click Edit. You will see Change Record Type button as one of the available Standard buttons. However, after saving the Page Layout. The button is not available to use on record.
The Change Record Type button is available on page layouts but only functions in Lightning Experience.
In Salesforce Classic, the button can be added to a page layout, but it will not be visible or usable on the record.
This behavior is working as designed.
Navigate to:
Setup → Object Manager → [Object Name] → Page Layout → Mobile and Lightning Actions
Then drag and drop the "Change Record Type" action onto the layout.
To update record types in bulk, use Data Loader.
Refer to the article:
Compare Lightning Experience and Salesforce Classic
How is record type access specified?
000382343

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.