How to adjust line spacing

I’m struggling to find this setting as the admin. Is this something only available to customers who use custom themes?

Thanks in advance!

What do you mean by “line spacing”?

Do you mean line height?

You can add custom code to a theme and override these CSS variables to change the line height:

Was referring to this.

Will try what @keegan suggested.

Is this only available to customers on the Pro plan?

I think it’s available to all plans except Starter, so yes, I believe the Pro plan supports it.