Found it
I removed the line: "visible": false,
from:
{
"uri": "widgets/Splash/Widget",
"visible": false,
"position": {
"relativeTo": "browser"
},
"version": "2.2",
"id": "widgets_Splash_Widget_31",
"name": "Splash",
"config": "configs/Splash/config_Splash.json"
},