@Sinan! Thanks so much for the kind words. I really appreciate that coming from you, because from what I know about you–you rock! It makes me happy to hear that you’re getting something out of those tutorials.
To mirror what @hBomb42 said, the short answer is that the good ol’ Reset button on the bottom right does the trick to reset the keying parameters, but you do have to be a little careful. Here are a few long-winded tidbits about it because that’s how I like answering questions:
In my experience, when you haven’t explicitly clicked on anything in the schematic, and you’re just working as normal in the Image node / master grade, the default behavior of the reset button is to actually ONLY do what you’re asking it to do—reset the selective keyer for the selective you have selected. You could have adjusted a bunch of stuff on the MasterGgrade node and created several gmasks too, but hitting the reset button only resets the selective’s key. It’s working this way because from the schematic perspective, the reset button resets your currently selected item, and since the MasterGrade node is a separate item / node from the selective, it’s unaffected when you hit reset.
If you were to explicitly select the MasterGrade node from the schematic or click on this Mastergrade tab while you’re working
(which has the same effect of, under the hood, selecting the MasterGrade node) then hitting the reset button wouldn’t touch the selective keyer and would actually reset the MasterGrade node. I just wanted to mention that because it could be tempting to think of the reset button as always resetting your Selective keyer, but in reality it’s just a context sensitive reset button and only resets what you have selected.
As an interesting sidenote, there is a button on the Arc Tangent panel called Reset All and it actually resets the whole image node back to its default settings. I find it interesting that that button exists on the panel but not anywhere I can see in the UI. I think you can set it as a keyboard shortcut- an entry called Reset Node / Timeline FX but I’m not positive that it’s the same thing, but I digress!
Hope that answers the question and gives you some insight as to how it’s working and why it’s working that way.