yes, my question is about Window > Float and if this can be set as a default. It's a pity that - despite (online) requests for this for quite some time, Affinity has never been updated to allow for this. It's one of the few "competition killers" that Photoshop has over Affinity. With a nice UWide monitor, it's an essential to be able to have this as a default. Having to select Window > Float each and every session is a royal PITA, and I suspect, one of the reasons why folk don't make the leap to Affinity.
For me now, without this function, I will probably only be using Affinity for its astro-stacking function - and even then only if it does a better job than Deep Sky Stacker.
Perhaps in future I'll do well to research what an app can't do, before commiting to buy.