@Giorgio67
use the below code to customize the menu as per your need and for more information please click on the below link
Command bar customization syntax reference | Microsoft Docs
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{
"commandBarProps" : {
"commands": [
{
"key": "new",
"text":"Add Employee"
},
{
"key": "editInGridView",
"text": "Quick edit",
"iconName": "EditTable",
"primary": true
},
{
"key": "share",
"iconName": "",
"title": "Share this List"
}
]
}
}
