Make a widget, add a Text box.
In it’s details panel there is a header called “content”. In that there is a box called “Text” where you enter it’s default/starter text. Hover your mouse over the left side of that row and a little icon of a 2x5 grid of dots appears.
What is that little grid for?
Some other things in the details have it too, but only some, and it appears to do nothing?!
What is it for? What does it do?