Execution Plan / Organize Tests tab greyed out

I have recently started using the Version Control with Test Complete - Git - Azure DevOps server. Came across some conflicts when trying to merge the Master branch to a branch I was currently working on and as result the Execution Plan / Organize Tests tab disappeared on me.

After selecting it from the view option at the top menu it came back but most of it is greyed out now.

Any idea what could make this happen?