When going into layout options, could it select the current score/part by default?
You’re not the first to ask for that 
I couldn’t find a thread asking specifically. It catches me out when I change a bunch of things and they don’t change. I’ve usually killed another score…
For me, it does…
If you have one or more layouts selected in the Layouts panel in Setup mode, then that will be the selection that’s chosen in the dialog when it opens; otherwise, it’ll be the current layout. We’ll consider changing this such that it only uses the selection in the Layouts panel when you’re actually in Setup mode.
Related to this:
It would be useful to have the option for the score/part shown in the layout window to also follow selection of layout (in the side window) in setup mode.
“We’ll consider changing this such that it only uses the selection in the Layouts panel when you’re actually in Setup mode.”
That would be good for me.