Positionning

In scroll mode under Harmony Assistant and Melody Assistant, or in page mode with handle display under Harmony Assistant, the miscellaneous items that define a staff can be moved.
Handles show current sizes and positions. Clicking and dragging these handles change sizes and positions.

Here is an example of display:

Changing bar size

The little red arrow pointing downwards, at the top of the staff area, change the bar left and right margin. Notes, rests and other objects, are displayed in the area between the two handles.

The vertical blue arrow change the total bar size.

If you wish to apply the a change to several bars at the same time, select these bars and apply change to any bar in the selection range. This change will then be applied to all the selected bars.

You are invited to view the video tutorial: "Bar size change. Scale, left margin, right margin."

Changing vertical positions

The little red arrows, on the left of the clef, change the position of the miscellaneous items within the staff area: bar numbering position, staff base line position, lyrics position.

The blue arrow on the left of the clef, change the staff height.

A single click applies a change to a single staff, for the whole content of this staff.
Shift+click applied the change to all staves in the score.

It is also possible, in page mode (Harmony Assistant only) or in the print preview, to change only the positions within a single staff system.
As a reminder, a system is a group of staves that play together.