Having trouble with editing grids (columns like to be automatic generated and can't remove them)

Hi Jose, thanks for your patience. This is my site, though I’m not sure if this is the correct way to share it.

https://preview.webflow.com/preview/itslenhuynh?utm_medium=preview_link&utm_source=designer&utm_content=itslenhuynh&preview=d7fbbb592f38709ecf16599348116266&pageId=621aee123dcec321f554f47f&workflow=preview