Please use following JSON codes to add space between multiple choice column.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"style": {
"flex-wrap": "wrap",
"display": "flex"
},
"children": [
{
"elmType": "div",
"style": {
"box-sizing": "border-box",
"padding": "4px 8px 5px 8px",
"overflow": "hidden",
"text-overflow": "ellipsis",
"display": "flex",
"border-radius": "16px",
"height": "24px",
"align-items": "center",
"white-space": "nowrap",
"margin": "4px 4px 4px 4px"
},
"attributes": {
"class": " "
},
"txtContent": "=join(@currentField, ', ')",
"inlineEditField": "@currentField",
"customCardProps": {
"formatter": {
"elmType": "div",
"txtContent": "=join(@currentField, ', ')",
"style": {
"font-size": "12px",
"color": "black",
"padding": "5px",
"white-space": "normal"
}
},
"openOnEvent": "hover",
"directionalHint": "bottomCenter",
"isBeakVisible": true,
"beakStyle": {
"backgroundColor": "white"
}
}
}
]
}
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