When creating a new record in Salesforce for an object with multiple Record Types using a custom button, the standard Record Type selection screen is bypassed and a specific layout is displayed automatically instead. This article explains how Salesforce determines which layout and Record Type are used in this scenario, and what limitations apply.
This article explains why a custom button in Salesforce can't be configured to create a record with a specific Record Type, and what Salesforce supports instead.
Salesforce currently does not support passing RecordTypeId within the defaultFieldValues parameter in custom buttons.
Because RecordTypeId affects routing behavior, layout assignments, and page assignments, attempting to force a specific ID may result in unexpected behavior or errors.
When you create a record via a custom button, Salesforce decides which layout to display using the following order:
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