How to avoid level streaming after switching camera

hi all, I’m working on a 3dmmo game and using world composition to make few sublevel for main map. My issue is the level will streaming when i open a actor in UI Widget and set camera view target to it. I’v tried frozen level with bIsLevelStreamingFrozen before and after switch camera view target, the level still will be reload.

The level will not be reload if i set the same location for ui actor with main actor. But the all object in world will be show up in camera. That’s why i put it far away from world.

There’s no postprocess by using capture2d to projection actor in UI. The effect is very bad. That’s why i do not use this way.

I hope to get your advice, thank you all.