By selecting choosing Font Type setting you are selecting between different font weights for your title. This option is also available for an active card and it controls the title font weight on that card.

You have 5 options: Regular, Italic, Thick, Bold and Bold Italic.

This is the title that is affected by this setting
Choose your own font weight by using Font Type dropdown

Click the dropdown and select one of 5 different options for your font weight.