Select View > Viewing Aids > Section Marks On/Off, or
Click the Viewing Aids button
on the Basic View Control or Advanced View Control toolbar and select
Section Marks On/Off
When you create a section, a section mark is displayed in the 2D plan view. The section mark contains markers at each end of the section line which indicate the direction of the section view. You can turn section marks on and off using the Section Marks On/Off tool.
To turn section marks on or off:
Select View > Viewing Aids > Section Marks On/Off, or
Click the Viewing Aids button
on the Basic View Control or Advanced View Control toolbar and select
Section Marks On/Off