in resources/welcome/main.js [43:57]
function openTab(tab) {
for(let i=0;i<tabs.length;i++)
{
$(tabs[i]).removeClass("selected");
$(tabs[i].replace("tab","tutorial")).css("display", "none");
}
$(tab).addClass("selected");
vscode.postMessage({
tab: tab.replace("#","")
});
$(tab.replace("tab","tutorial")).css("display", "block");
}