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How to select objects
Click
Click to select a unselected object under mouse. If there are multiple objects under the mouse, click again to switch the selected object in a selection. Click on the blank space to end a selection. When no Shift or Ctrl key pressed, click on the blank space will clear all previous selections.
[Shift] Key
Multiple selection mode, the previous selection will not be cleared even clicked on blank space.
[Ctrl] Key
Multiple selection mode, select all objects under mouse with a single click.