Locked non selectable lines imported dwg

If I may Kindly ask for a little help, I cant select these lines …I’m still learning go easy on me :upside_down_face: I assume this is not a native .dwg because everything worked when imported “text etc” :joy:


CEILING MAIN FLOOR AOH.3dm (8.9 MB)

Those are messed up linear dimensions.
I isolated the top one, selected it near the left end, and ran BoundingBox.
I made the Boundingbox magenta.
The dimension can be selected but only inside the box:

These appear to be linear dimensions that have problems… They do select with Ctrl+A. You’ll have to fish a bit to find them.

I highlighted one:

thank you