How to set model to print solid instead of hollow? - Getting

Hello! I’m not only brand new to Snapmaker Luban, I’m new to 3D printing. How do I set a model to print solid instead of hollow? It’s a small piece for a phone accessory, and I need it to be solid for strength sake. I also need tips on adding break-away support for portions of the piece that are basically hanging over empty space. I edited the model to put some small vertical columns but they must have been below some minimum threshold, as the “Generate G-Code” step seems to have ignored them

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