It's either right in front of me or it doesn't exist: The terrain I'm working around keeps getting selected wheneven I try to click on a specific object in the scene I'm planning. Moving the terrain away (adding 1000 to the location coordinates) is simple enough, but it'd be easier to have it become "unclickable" temporarily, for blocking purposes.

How do I do this? Or am I out of luck?

Create a new layer.
Move the objects you don't want to to be selectable to this.
To make them unselectable, click on the "eye" icon to the right of the layer name, it will turn into a "padlock".
To make the items in the layer selectable again click on the "padlock", then click on the "closed eye" (note don't try double clicking, as this will start edit mode for the layer name).

Ok, I've seen the "eye" in other programs, and I see nothing like that here, nor Layers. You are talking about Vue Easel, right?

Quote - Ok, I've seen the "eye" in other programs, and I see nothing like that here, nor Layers. You are talking about Vue Easel, right?

I've got Infinite, so if layers aren't available in Easel, then there probably isn't a mechanism for doing what you want.

No layers in Easel, I couldn't find any

No layers in WEasel no "hide objects" in any other form - without moving them in one axe outside of your camera view.

I normally do that by adding a number to one axe that i can delete easily again. For example simply add 111 in front - and remember later that if you delete those "111" the object is in the correct position again.