Zoom options

[AlistairNWard]

1. I'm looking for a variant and zoom in on a region. I then want to get rid of any zoom, but I can't find a way to do that. Maybe in the Zoom box (where we have the zoom in and out buttons - which may grow to include x10, x100 etc) we should have a reset zoom button?
2. I don't know how useful the previous zoom is. Someone will likely have zoomed out, so now they just need to zoom in. Also, if we keep this, the title Previous Z is not clear
3. Sometimes, a Focused SV option becomes available. I've zoomed away from an SV and also NOT had this option pop up. I don't think it's a bad thing to be able to revert focus to the selected SV, but maybe we should just keep this always available rather than it sometimes being there, sometimes not. I've also had it appear on top of the Previous Z which isn't great. Could also do a better name, e.g. Selected SV or any better ideas?

I'm thinking we'd be better with a zoom bar with all options always available within the bar