Custom links and buttons always open the target content within a new window. The HYPERLINK function can now accept an optional third parameter to control where content is opened. You can do this by creating a custom text-based formula field that leverages the HYPERLINK function to perform the requested functionality.
Parameters for opening links and buttons in Salesforce
To control where a custom link or button opens its target content, use the HYPERLINK formula function with the optional third parameter. For example, a Sales Rep using Salesforce Classic may want to open an internal tool in the same browser tab to avoid disruption.
The HYPERLINK takes the following parameters: HYPERLINK(url, friendly_name [, target]). Available options for the third parameter are:
Example HYPERLINK:
000385504

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