TeamViewer 14 Free - Client/remote Mouse/keyboard issue

Loved TV 14 update until...I've found that controls to 'Disable Remote Input' have now been disabled in the Free version.  The problem is, in providing support for a non-profit LPFM radio station, that one remote client PC is locked to allow remote input, while another is locked in the disabled status.

I need to ALLOW remote input on the clent PC that has remote input disabled, as there are times when I need to monitor what the 'DJ' is doing.  This is not possible, if they are locked out from performing their tasks,.

What is the remedy for this situation, please?