With your item highlighted on the left hand menu, click on the 'inventory' tab in the right hand screen. You'll see a little tick box that says 'Object can be taken'. Make sure it's ticked!
Is that what you were looking for?
Conversely, if you make items you don't want people moving around - maybe it's a container like a desk or a cabinet, or something you have to use such as a sink - make sure the box ISN'T ticked.
Maybe the internet is slow and the game did not update.
By the way, did you publish the game yet?