Hello @Peter !

The checkbox set is packed to the div with the .bx-form-input-checkbox_set. So you may add to the Custom Styles area of your template the following code:

.bx-form-input-checkbox_set {
list-style:none;
display: flex;
flex-wrap: nowrap;
flex-direction: row;
}

You may test different variants of the margin or padding of the input and label elements.