Problem

The current UI is rather "aggressive" about opening a preview window for a stage. It opens when a stage is is single-clicked, and when a connecting line is attached. Often I don't need the preview at that moment. Later, when I do need it, I have to click on a different stage (thereby opening its preview), and then click back on the one I want.

Proposed solution

Move the function to open a preview window to a double-click on the stage, and/or a "Preview" option on the right-click menu.

Alternatives considered

No change

Additional context

This may also make it easier to draw a connector from the source stage to the target. I often immediately try to do this after adding a new stage, and I get a preview of the source stage instead of the line-draw function.