According to Apple in the article below, you can temporarily remove an iOS device from the list in icloud.com/settings so it doesn’t appear in this list until it goes online again.
I’m curious to know why would anyone ever want to do such a thing.
I’m just trying to grasp the ins and outs of Find my iPhone and Activation Lock.
Any clarification much welcome.
https://support.apple.com/en-gb/guide/icloud/mmfc0eeddd/icloud