Changes to the next open document (according to the TabBar above).

Place a new instance of the component onto the schematic.

Place the elements onto the schematic (from the clipboard).

Selects file.

Selects the element below the mouse cursor. If several components are placed there, you can clicking several times in order to select the wanted one.

Sets the starting/ending point of the wire.

Deletes the selected elements or enters the delete mode if no element is selected.

Displays menu with: open, rename, delete, delete group

Rotate the elements.

Rotate the component. (Has no effect on diagrams.)

Changes the direction of the wire corner (first left/right or first up/down).

Clicking on a wire selects a single straight line instead of the complete line.

Deletes the selected elements or enters the delete mode if no element is selected.

Scrolls vertically the drawing area. You can also scroll outside the current size.

Allows more than one element to be selected, i.e. selecting an element does not deselect the others. Clicking on a selected element deselects it

Changes the position of selected markers on more-dimensional graphs. If no marker is selected, move selected elements. If no element is selected, scroll document area.

Changes the position of selected markers on their graphs. If no marker is selected, move selected elements. If no element is selected, scroll document area.

Opens file.

(drag and drop file into document area) Tries to open file as Qucs schematic or data display.

Zooms into or outof the drawing area.

Scrolls horizontally the drawing area. You can also scroll outside the current size.

(double right-click) Opens a dialog to edit the element properties (The labels of wires, the parameters of components, etc.)

(double right-click) Ends a wire without being on a wire or a port.