User can not click existing project names in the Project Explorer area.

Description of problem:
As summary.

Version-Release number of selected component (if applicable):
6.0.1

How reproducible:
50%

Steps to Reproduce:
1. Go to maitai-bpms site.
2. Clicking Create a process on the home page then select ou is 'testouname1', repo is 6, the project is yy then try to switch to other project.

Actual Result:
User can not see the project name list completely as attachment, so can not click other project name.

Expected Result:
User can see the project name list completely and can click other project name.

Additional info: