I think it’s important to explain that you can switch from WS to another WS and they all size just like they should.
The issue is when double clicking a part from the project page the key editor opens the last sized editor that was opened from the WS…in my example, my last WS was the key editor in the upper half of the monitor and drum editor in the lower half of the monitor. So now if I delete either or both editors, then double click a part in the project page, the key editor will show up in the upper half of the monitor when I would want it to take up the full monitor.
As far as the Key & Drum editor issue maybe you can turn that one in? It’s really a different issue right? You have “link editors” checked in the preferences. But what is the state of the Independent Track Loop buttons in both the Drum and Key edit windows?