Question:

User is not able to access the 2 Weeks view when selecting Cycle Plan in My Schedule. 

Answer:

This is working as designed.

Since the Cycle Plan details occupy half of the screen, the 2 Weeks view is disabled, otherwise, they would make the cells too small from a usability perspective. As it is not possible to resize the My Schedule window, this option cannot be accessed.

Related Documentation:

CRM Help Documentation:

Scheduling Calls and Activities