When I try to use remote computer from my MacOS 10.15.4 machine with Horizon 5.4.2 I have no working mouse on the Horizon window.
Saw another posting where somebody suggested going to Privacy/Accessability and unchecking Horizon under Allow Apps Control of my computer.
When I try this horizon will not uncheck, the apps above it can be changed nut horizon will not.
I have un installed and reinstalled Horizon with no impact.
Any help will be greatly appreciated.