Open a new canvas file in a text editor and paste the following:
{
"nodes":[
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{"id":"71f8810fc415ed60","type":"group","x":145,"y":-260,"width":795,"height":920,"label":"-"},
{"id":"411104054bcd94b5","type":"group","x":-940,"y":-900,"width":1012,"height":560,"label":"Urgent & Important"},
{"id":"24d3d3fdeaca0177","type":"group","x":145,"y":-900,"width":795,"height":560,"label":"Urgent"}
],
"edges":[]
}