You can remove sub-chart breaks one at a time or all at once.
To remove selected sub-chart breaks:
·         
 Select any boxes containing a sub-chart break ( ), then click the Insert 
 tab and select Sub-chart | 
 Remove.
), then click the Insert 
 tab and select Sub-chart | 
 Remove. 
To remove all sub-chart breaks in the entire chart:
· Click the Insert tab and select Sub-chart | Remove All. All the sub-chart breaks are removed.