DELFTship layers are, by default, Hydrostatic layers. (you can disable this in the Layers menu)
However, in order for DELFTship to be able to do meaningful hydrostatic calculations, your model must follow a few rules- one of which is the absence of ‘leak points’. If I look at your images I get the feeling this may not be the case, bus as you do not show the control net, I can not tell for sure. ( It looks very possible that you still need to ‘stitch’ several parts of your hull together)
On the Tools tab there is a ‘Check model’ button, which will give you a summary of issues found in your model.