It’s an option under the n-panel. Just press the appropriate button and adjust the length:
EDIT: lol, sorry. I didn’t realize this was the section for 2.8. They changed it into an overlay:
It’s an option under the n-panel. Just press the appropriate button and adjust the length:
EDIT: lol, sorry. I didn’t realize this was the section for 2.8. They changed it into an overlay: