I was fed up with my PC running extremely slow and sluggish so I disabled
automatic Defragmentation and disabled windows Search service under
services.msc.

But when I go to Performance Rating and Tools (under System and Maintenance)
I try to click on the Adjust Indexing Option on the left pane but nothing
happens. It completely ignores all my mouse clicks on that option. The other
options in the left pane respond fine.

So I gave up and went to C: and under properties I disabled Indexing
Service. But I'm still a little concerned as to why the other option
mentioned above did not work. Is it disabled in Beta 2 or is this an issue
with my install only?

Hello,

This is a known bug.

You can access Indexing Options here:

Control Panel -> System and Maintenance -> Indexing Options

- JB