How to show message for user?

My RPA initially will be assisted for a user for evaluation.
I want to show a message for the user while process something in background.
“Message box” don’t work because the user need press the button.
“Callout” don’t work because the user can close it.

Something like this:


The above scenario is possible in 2017.1

Try System Trigger with Mouse Block Evenet along with your call out (Be Careful the way you do)

Didn’t works with me, the block only execute after a first user click.

The box of “Callout” activity is very small, and the time is pre defined.
The ideal would be show a message after start background process and hide after process finish.