Did you try to uncheck the first one , scroll down the grid and see if the checkbox will change back to checked state? I’m a beginner but when I see
columns: [
{"pinned": true, "hidden": false, "text": "Admin Role 1", "datafield": "Role1", "width": 150},
{"pinned": false, "hidden": false, "text": "Admin Role 2", "datafield": "Role2", "width": 24},
{"pinned": false, "hidden": false, "text": "Admin Role 3", "datafield": "Role3", "width": 152},
{"pinned": false, "hidden": false, "text": "Admin Role 4", "datafield": "Role4", "width": 40},
{"pinned": false, "hidden": false, "text": "Admin Role 5", "datafield": "Role5", "width": 96}
]
I think that they will change back to unchecked statut, you can try to remove “true” and “false”
