What if you temporarily remove the Secret Plans folder from your Desktop folder, carry out some other sync operations (deletions and additions) on all three sides (laptop, phone, and tablet) to confirm that the three devices are in sync, and then put the Secret Plans folder back?
On discord, James concurred with the approach to go to each device and exclude the folder from sync. Then on the devices where you don’t want the folder, delete it.
This is an interesting topic, but surely the suggested solution would only work until the next sync took place and the removed folder would be back.
The only way I see this would be possible is if obsidian had explicit command for excluding a folder(s) thus allowing it to be local to the device in question.
Right. The problem was getting all the devices “on the same page,” as it were. Getting the portable devices to a state where the folder’s absence was recognized as a synced state. The folder should be excluded in settings on the device where it resides; this was not in question in my suggestion.