Can't remove the underline from text block

Thanks for the answer Janne.

I created the class just when editing this text so it should be the parent class right? (I am new to these terms so I might be missing something.)

To be sure I deleted the class and created a new one and it also has the same problem. Underline still shows up even though I select no decoration.
Screen Shot 2020-09-26 at 5.30.48 PM Screen Shot 2020-09-26 at 5.30.58 PM