Activate the command: 
Application Menu 
Options FEA Editor tab, or 
Tools Options Application Options FEA Editor tab.
The FEA Objects section of the FEA Editor tab will allow you to adjust the size and color of the icons used to symbolize the loads and constraints in the display area.
The When model is moving section provides options to control the detail that is displayed while the model is being moved in the display area. Depending on the graphics resources, displaying less detail will speed up the rotation.
Use the Other Colors section to control the colors used for specific situations.
The Inquire Decimal input specifies how many digits after the decimal point are shown in the tooltips when the mouse hovers over the vertex, or when displaying the distance between two vertices.