The "Label" block consists of a set of controls with which you can change the design of your tags:
"Font size" - the size of the tags, the value "auto" means that the size will automatically be calculated depending on the type of counter and the size of the digits of the counter.
"Font Family" - a list of available label fonts, the value "auto" means that the font will be used the same as for numbers.
"Color" - the main color of the labels in the counter.
"Padding" - margins of marks, helps you to set additional gaps between adjacent objects of the counter.