Mouse button

This

Does this...

Left

Click element

Addresses or selects an element.

SHIFT + click element

Addresses or selects an entity group.

Click and drag in workspace

Selects elements in a rectangular region.

Middle

Double-click

Sets the display scale so that all the visible elements are displayed in their entirety.

Click and drag

Pans in the current viewport.

SHIFT +
click and drag

Pans in the current viewport.

CTRL + click and drag

Zooms in.

Right

Click in workspace

Depending on setting in the Options, Desktop environment - Mouse and crosshairs page: Opens and closes the brackets, or opens the shortcut menu for selecting elements.

CTRL + click in workspace

Opens the shortcut menu for selecting elements.

Confirms the entry when requested in the dialog line: <confirm>.

Click a toolbar

Quits a tool (= ESC key).

Middle-
Left

Click element with middle and then left mouse button

Selects a segment.

Middle-
Right

Click in workspace with middle and then right mouse button

Enables the selection rectangle. Use the left mouse button to enclose the desired elements in a selection rectangle.