How do I set the featured image size on the single post?

Good day! I’ve tried searching for the answer from other posts, but overrides didn’t seem to work for me. Basically every time I have a single post the featured image is the first image and it’s always so much larger than the rest of the image. When I try to resize by editing, it only changes the resolution.

Additionally, on mobile it remains the same big size, while my other added media become optimised for mobile. Help anyone?

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