How can I delete a ceiling?

Do you have multiple floors? Have you added floors or basement? If so please refer to @Yolo Interiors 's reply (you will have to edit the floor of the upper floor). And here is the multi-language tutorial: https://www.youtube.com/watch?v=H2aTuurycUg

I have 2 floor but no basement. And my swimming pool was on the floor 1

Do you have multiple floors? Have you added floors or basement? If so please refer to @Yolo Interiors 's reply (you will have to edit the floor of the upper floor). And here is the multi-language tutorial: https://www.youtube.com/watch?v=H2aTuurycUg

oh! I found there is no this button!

Also, if you have multiple floors and the ceiling of the lower floors is defined as the floor slab of the upper one. For example, if you want to delete the ceiling of the 1st Floor, you need to switch to the 2nd Floor and click "edit floor", and then to shrink the corresponding floor area of the 2nd Floor.

Hi, Please click on the room and select no for ceiling.

Hi, Please click on the room and select no for ceiling.

Also, if you have multiple floors and the ceiling of the lower floors is defined as the floor slab of the upper one. For example, if you want to delete the ceiling of the 1st Floor, you need to switch to the 2nd Floor and click "edit floor", and then to shrink the corresponding floor area of the 2nd Floor.