In Series labels section 'Apply Setting To' works with Values Font and Font size, but doens't work with B, I, U font properties. The B, I and U toggle buttons affect all series ignoring 'Apply Setting To' selection. This happens at least in the Line chart visual, I din't check other visuals yet.
I have reported this issue internally, ICM: 278937461
I will update here once I get any information.
Thank you very much!
Community Support Team _Robert Qin