As per Appian 21.1 (https://docs.appian.com/suite/help/21.1/Web_Link_Component.html) now we should be able to open the link on same tab.
I tried testing this but the link opens in new tab regardless of the value that is set to the parameter openLinkIn
Test Code in 21.1.
a!sectionLayout( contents: { a!linkField( links: { a!safeLink( label: "Safe Link", uri:"">https://appian.com/", openLinkIn:"SAME_TAB" ) } ) } )
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