You can see other applications a candidate has applied for whilst viewing their application to a specific job. You can't see this information if viewing the candidate in the Talent Pipeline.
First, browse to the navigation on the left hand side of your screen and select 'Manage Jobs' under the 'Jobs' section.
Locate the job which the candidate applied to and click the job title to open it:
Next, click on the name of the candidate who you want to view other applications for. Then, click the 'Other Applications' tab (if available):
Note that if they haven't made any other applications this tab won't be visible.
Click the 'View' button next to the job application you would like to view. From there you can see comments and scorecards for that application.