According to the screenshot you provide, I guess there is a multi-line text column in the list. By default, the height of each row is decided by the height of each multi-line text column.
If you want to reduce the row height and make the same row height, you could apply following JSON codes for the multi-line text column.
Note: It will cause some lines in multi-line text column are not visible and only multi-line text with plain text can be applied JSON codes.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "@currentField",
"style": {
"height": "50px",
"align-items": "normal"
}
}
And for the color of conditional formatting, the line "height": "50px" controls the height, change the parament as the same as multi-line text column.
Result:
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