Ninjin and Thesbu, maybe this will help: Setting Up Visual Studio Development Environment for C++ Projects in Unreal Engine | Unreal Engine 5.1 Documentation
I think one reason I may not have these issues is that I use VAX (Visual Assist X, from Whole Tomato Software) both at work and at home instead of Intellisense. On the stream, we didn’t have VAX installed, and just mentioned to me that she thinks we had the red squiggles. (And also reminded me of that link I just sent! Thanks, Lauren!) In the stream, we didn’t do anything with the components other than just spawn them - all the positioning and setting of values that we did was handled in Blueprints. So the autocomplete issue wouldn’t have come up for us. If this is the case, unfortunately, there’s not much I can do, as the issue would be with Intellisense. But you can at least disable parts of it (as shown in the link) to get the false errors to stop showing up. I hope this helps!