Currently policy roll out cannot be run in the background.
You can perform the roll out during off-peak hours like for example at 12:00 AM in the midnight.
You can also submit this as a Product idea as per KB60021 .i.e to automate policy rollout to run in the background so that you can continue to work on the ESM.
You can also submit another product idea for a scheduled policy rollout say for example that would automatically roll out policies for datasources on ERC's at your required time at 12:00AM in the background.
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