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A conditional line-break will be activated only when necessary, that is when the conditional line-break is encountered within the right-fill-area as which is typically the remaining 30% of the line assuming that the line-fill-percentage is set to 70%.
Using conditional line-breaks instead of fixed ones makes it easy to change scaling and other layout parameters without the need to adjust explicit line-breaks.
Use the button 
from the bar line menu to insert a conditional line-break.
