Simulator CSS Watcher

[jsfan3]

I'm making the final adjustments to theme.css in light and dark modes. However, if I leave the simulator open, the updates aren't applied. I have to close it and reopen it. For example, I had:

@media (prefers-color-scheme: dark) {
    Label,
    SpanLabel,
    SectionText,
    CheckBox,
    RadioButton {
        color: #eef2f7;
    }
}

I changed it to:

@media (prefers-color-scheme: dark) {
    Label,
    SpanLabel,
    SectionText,
    CheckBox,
    RadioButton {
        background: transparent;
        color: #eef2f7;
    }
}

But until I closed and reopened the simulator, I didn't see the change.

Do I need to do something specific to see the effect of CSS changes in real time, or does it just work sometimes and not others?