Space feature unclickable on

Hello, 
We are working on a building layout from an IFC file. We imported it with the 'for design' feature so that the elements (walls, doors...) are recognized.

We want to create a "Space" to work inside a single room of the building (isolated) but we cannot click on the feature 'Space'. Do you know how to resolve this ?

Thanks for your help

Edu ​​​​​​​