Fig A is where I am trying to get to by watching that tutorial.
Fig B is what’s really happening - can’t extrude the way it’s shown in the tutorial.
Why is it doing that?
I had that exact same issue when I did the tutorial in late 2021. I just assumed I’d done something wrong and gave up on it and did a different tutorial.
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I watched that tutorial 4 times and I am sure I did everything right but it’s giving me a completely different result. Is there a way to circumvent that or fix it?
Click on the icon next to the value (-3 in your case), it will give you options to extrude. By default it’s Subtract, but you can create new body, union etc.
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Yes you are right! It worked with Union, I didn’t think to click on that icon.
Thank you 
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We learn something new every day 
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