Slur
A slur is a curved line between two or more notes that indicates they are to be played without separation. If you mean to join two notes of the same pitch, see Tie
Instructions
- Leave note entry mode and select the first note:

- S creates a slur:

- Shift+Right moves the slur end to the next note:

- X flips the slur direction:

- Escape ends Slur Edit mode:

Adjustments
The boxes or handles (displayed in the images for steps 2-4 above) can be adjusted with the mouse. The two outer handles adjust the start and end of the slur. The two inner handles adjust the contour of the slur.
A slur can span several systems and pages. The start and end of a slur is anchored to a note/chord or rest. If the notes are repositioned due to changes in the layout, stretch or style, the slur also moves and adjusts in size.
Note: It is not possible to change the start and end anchor notes using the mouse. Use Shift + left or right arrow keys to adjust the start and end points of a slur.
Dotted line
Dotted slurs are sometimes used in songs where the presence of a slur varies between stanzas. Right click on a slur and choose Slur Properties.... From the Slur Properties dialog you can choose whether you want a solid slur or a dotted slur.