Multiselection in UEFN simply cannot be understood or used by a beginner. Here is why:
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It requires a specific keybind to work (rectangle select) that is not shown anywhere (Ctrl+Alt+ hold mouse button). I would instead set left mouse button hold to do that, both click holds are currently camera pan and that seems superfluous, leave right click to be the pan only.
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Everytime you rectangle select, you also select WorldDataLayers and WorldPartitionMiniMap, and because those are locked from being moved, you rectangle selection will have no translation controls.
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So you are like, fine let me unselect those two so I can move the selection. The outliner doesn’t show you the selected group of actors, so it’s impossible to find WorldDataLayers and WorldPartitionMiniMap in the outliner when you have 1k + actors (20k is the avg we do on our projects to give a rough number). You have to click the little cog icon in the outliner, then press “Show only selected” which adds a lot of extra steps simply to select a selection of actors.
Solution:
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Add a “cannot be selected in viewport” translation setting, which exists in the right click menu of the actor. Actors that have that cannot be left-click selected, only right-clicked so you can disable the setting.
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Apply the above setting by default in all projects to WorldDataLayers and WorldPartitionMiniMap
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Rectangle select to be left click hold, not Ctrl + Alt + left click hold
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When you rectangle select, “Only Selected” becomes active, and you can toggle it in the same outliner settings menu. After that, when selecting a single prop, it becomes inactive.