In Salesforce Lightning Experience, Custom Links configured to open in a new window may instead open in a new browser tab.
it is controlled by the user's browser settings. Modern browsers like Google Chrome and Mozilla Firefox are designed to open links in tabs by default, regardless of how the link's target is configured
Salesforce Custom Links use standard HTML link targeting (target='_blank') to open content in a new browser context. Whether this opens a new tab or a new window is determined by the browser, not by Salesforce. The steps below describe how to change this behavior in common browsers
Web browsers may opt to open links in new web tabs instead of new windows even though they are configured to open in a new window.
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