Under Settings> Advanced> Approvals , you can turn on the Manual appointing option: Require all approvals on and off at the company account by ticking the box: 

This option applies to cases where one or more approvers are manually appointed for an expense:

If the setting is off ...

... then one coworker will be able to approve an expense finally, even though several employees have been manually appointed to approve the expense. So, for example, although three employees have been manually appointed to approve an expense, the expense will be finally approved as soon as the first of the three employees approves the expense. 

If this setting is turned on ...

... then the expense will only be finally approved when all the employees who have been manually appointed have approved the expense. 

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