1. Mouse activation possibilities
Left mouse click on the element: the element is activated.
Shift pressed and left mouse click: additional elements can be activated
Ctrl pressed and left mouse button: deactivate activated elements
Lasso from left to right: all elements that are completely in the lasso become active. (white lasso)
Lasso from right to left: All the elements that are in the lasso or that touch the lasso become active. (red lasso)
Mouse wheel click on the active element: the active element is deactivated.
Works also with the Escape key or left click in the empty space
Right click on the element: the element is activated in addition to the element already activated.
2. activation variants
Active point (red dot): The first point on which you click with the mouse becomes the "active point". This point is considered as reference point for functions such as "move", "copy", "rotate", etc.
Define the active point yourself: The active point can be redefined with Ctrl + (R) inside the active element.
Active segment (white dotted line): The segment of an element that has been clicked on becomes the "active segment". The nearest point also becomes active.
Active facet (white outline): The facet of an element that has been clicked on becomes an "active facet". The nearest facet also becomes active.
The active point can be retained if the other elements are activated with Shift + (R) + Lasso.