Well, they don't disappear exactly, but when I bring in a prop to a large scene, I have to hunt for it... sometimes never finding it.  And when I do,moving it to the correct location is a big pain.  Does anyone know how to 'mark' a location before bringing in a prop so it shows up in the general area?

Usually if you double click on a prop or avatar it will place it at coordinates 0,0,0... If you have dragged and dropped an avatar or prop click on the Home button (shaped like a house and the camera will center on it. Hope that helps.

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Cancer Survivor - Retired Teacher - Geriatric Icloner still learning
Hardware: ZX80; Operating System- ZX80 Basic; CPU - ZX80 @ 3.25 MHz; Memory - 1KB; Hard Drive - N/A; Storage - Cassette; Monitor: Any old CRT TV

Thanks ... I finally figured out, that after dragging in a prop, I can assign it the same coordinates as something close to where I want t to be ... such and obvious and simple method ... but I'm always looking for a click-it method .... I need to exercise patience.

Even simpler would be to use "Align to" function...