2018 Mini not sleeping with Catalina

[Janeilfen]

Hi,
As the title says but only when there is an external drive plugged into any of the ports. The drives are inactive and have been unmounted.
Sleeps OK with nothing plugged in. They also seem to have deleted the put computer to sleep slider from energy settings.
These observations are since coming from a 2010 MacBook Pro running High Sierra.
Anyone else having this experience, or would there be a solution?

 

[Taz Mangus]

Try booting into safe mode and see if the computer sleeps with the drives attached and unmounted.

Start up your Mac in safe mode - Apple Support

To help determine whether an issue is caused by software that loads as your Mac starts up, you can start up your Mac in safe mode.

support.apple.com