You can set a progress bar for a microflow when assigning it to an Action Trigger button or an Invoke button on a datagrid. If you click the button and go to Behavior in the right hand Properties panel, click the '...' button. This will give a pop-up where you can assign a microflow, as well as set it on long running, Blocking y/n and set a Progress Message to show.
Select the action trigger.
Open property: Microflow under section behavior.
Select Progress Bar: Modal
Fill in your Progress message.
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