Hi @heyutsho,

Welcome to the Community! Thanks for bringing this to out attention, would love to share insight here!

While this does seem to be a limitation of the new template editor that our team is currently working to fix. However, you can still bold the text by either using a text with a  heavier weight such as Arial Black or using one of your current custom fonts but with a heavier weight. @Anna McCarthy has an incredible series of articles she’s created on the topic of the new editor that addresses editing custom fonts in the new template I’d recommend checking out! 
 

Thanks for participating in the Community!

-Taylor