Shift
Use the Shift action to change what happens to the selection when you Shift+Click an element or hold Shift while drag-selecting. Click the Shift button to switch between the three states: Add, Remove, or Difference.

From the main menu, select Tools > ProBuilder > Interaction > Toggle Drag Selection Mode.
The button displays the following to indicate what state the action is in:
Icon mode: |
Text mode: |
Description: |
 |
Shift: Add |
Shift+Click adds the selected elements to the current selection. |
 |
Shift: Subtract |
Shift+Click removes the selected elements from the current selection. |
 |
Shift: Difference |
Shift+Click toggles the selection: it adds unselected elements and removes selected elements. |
This action is available in the vertex, edge, and face modes.
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