Hello Skandha, thanks for having a look. The site is: https://jaochateau.nl/.
So maybe to clarify a bit more. In WordPress standard editor/dashboard I can create and edit blocks with text, tables, images, etc. and place them in an order. Only in the customizer am I able to add theme options, but there I cannot reorder blocks and theme options. In fact, there is nothing I can customize on the blocks in the customization view. Hope you can find a way 🙂