Selection - Lock Elements

So far the most time-consuming element of the building process is ensuring I haven’t selected something that I shouldn’t when I multi-select with Ctrl + Alt. What happens most of the time is that I select the landscape, grid island or the water.

Would be nice to be able to lock these or have a separate Outliner just for those so we can quickly go between construction/props and landscape/water without having one affect the other while editing it.

EDIT: Found how to lock elements, by right clicking on the actor > Transform > Lock Actor Movement