The Mirror button allows to mirror a selected entity or entities relative to a given axis.
The Mirror 
button can be found in the Editor tab under the Instruments section.
Select an entity and press the Mirror button.
Example:
| • | select an entity or a group of entities: |
| • | press Mirror button; |
| • | left mouse button click to set first mirror axis point: |
| • | moving mouse cursor to get the necessary placement for the selected entity(ies) or use the dynamic input; |
| • | left mouse button click to fix entity(ies) at the new placement: |
Note: selected entity(ies) are copied if Fast Entities Input 
mode is on:
