If you are trying to change the alignment of the label of the property line, then you probably can’t do that with properties on the control since the label text is an child html element whose styling is being controlled by CSS.
You could probably affect the styling by providing an external CSS stylesheet in the page that has CSS styles that have higher specificity than the default styling rules to override those.
For example, set the “CSS class” property on the property line controls to “my-property-line”.
And then in an external CSS file, create CSS styles to apply styles for the elements that have that CSS class with something like this:
.my-property-line label {
text-align: right
}
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