How can I configure a hotkey (ideally F7) to open the standalone viewer? I want to have exactly the same behaviour as right-clicking on the viewer pane button.
Edit the button and assign the hotkey you want to it.
Settings > Customize Toolbars and Keys, to start editing buttons.
Since F7 is already assigned to the other button, you'll also want to edit that one and remove its hotkey.
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Amazing, thank you. I actually tried to do that, I just didn't know how to expand the button. So for others: you have to left-click on the button (in edit mode, as Leo wrote) and this will bring up a dialogue with all the integrated buttons, which you can now edit in the same way as a simple button (right-click and Edit).
BTW @Leo, there is no hotkey shown (see screenshot) for the Open Linked Viewer, even though I have already set up a F7 for it. Maybe a bug?
You have to either add the hotkey to the label manually or, easier, turn on Show hotkey in label for the button.
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Absolutely right, as always 
