#Selecting in a sketch

The arrow - the "Select" button or the S key; Esc from any tool also brings the arrow back. With the arrow in hand a click selects geometry instead of drawing.

#How to select

• A click on a line, an arc, a circle or a point selects it and lets the previous selection go.
• Shift + click adds to the selection; a second click on something selected lets it go.
• A box from left to right selects what lies wholly inside the box.
• A box from right to left selects everything the box touches. With Shift a box adds to the selection.
• A click on empty space or Esc clears the selection.

#What to do with the selection

The editing tools and the constraints take what is selected: Delete removes it, a constraint button ties it, "Construction" turns it into layout, and the mirror, the offset and the patterns work on it. A point or a line can be dragged with the mouse - the sketch follows its constraints and dimensions.

#Lines lying over each other

A rectangle drawn against another lays its side over the neighbour's: two lines lie where one is seen. A click takes one of them. To take the one you mean, right-click it and open Curves lying here - it lists every line of that place with its number, the rectangle it is a side of, and its length. A click on a row selects it.

#If it does not select

• The neighbour is hit. Zoom in with the mouse wheel.
• The selection goes at a click. Hold Shift to add rather than replace.
• The wrong one of two lines lying over each other is selected. Right button -> Curves lying here, pick the one you mean.