iCloud Desktop & Documents sync on Mac
I have a Mac mini M4 running Sequoia and a MacBook Pro 2015 running Big Sur. Both of them have a 256G hard drive. On my mini in the iCloud settings there are the options to Sync this Mac which is checked and the option for Desktop & Documents folder which is not checked. If my Mac is already being sync'd with iCloud what does the separate option for Desktop & Documents do? Also my MacBook Pro has the iCloud Drive option checked but the Desktop & Documents option is not checked.
Please help me understand how to use these options.
Thanks
Mac mini (M4, 2024)