Noise Reduction Adjustments Don't Export

Hello all,

I am using Lightroom on my desktop. I'm loving the noise reduction, however, the changes don't appear on my exports. Some don't even appear in the section before I hit export (no idea what this bit is called! But it's not where the editing happens, it's after I've gone 'File > Export' where I can select export quality etc. In the settings section, I have selected 'large JPEG', full size, 100% quality. I am exporting 187 photos at once. I'm new to Lightroom as I have used Capture One so go easy on me! Any help greatly appreciated. Thanks in advance!