Am I getting myself confused ? ... again ... 
I just turned on my iMac and it seemed to have the same workspace that I have been using on my MBP all morning (complete with a problem search ... a different issue).
I cannot remember using the iMac for this type of work (testing a search) ... I seem to remember that it was using a completely different layout.
I understand (and desire) that saved layouts are synced ... but this seems to be the syncing of my current layout across my machines ... am I imagining this? 
I use different machines in different locations for different purposes, and my family use it on their machines at home, again for different purposes ... I am pretty sure that they do not want their layouts trashed by my temporary layout etc.
Thanks.