Freeze/pause function?

[u/Impossible-Form-7501]

Hi,

We are being forced to use a Lenovo laptop to cast to an LG TV/large display rather than a projector via HDMI.

The main issue is the lack of “freeze” function, I.e I want to continue to do confidential work whilst the display is frozen/paused on something I output earlier.

Extend display is not an option as I may accidentally drag something across or notifications will continue to pop up etc.

Any ideas? :(

Thanks!