Change Level streaming method to Always loaded crash Unreal

Hello all !
I’m rendering sequences from Unreal 5.2 and i’ve to “play” with levels in that sequences.
I’ve put Foliage on a level, element on another etc.
And i’ve to make it visible or sometime not, so i’ve found the way to change it in the sequencer perfectly and it work.
When i try to render a sequence, it render without level, and ask me to change the streaming method, with blueprint or another C++ way that i can’t do, because i’m not a developper…
So, i’ve read here that i’ve just to make my level “always” loaded… To render it as a cinematic sequence, exactly that i need !

BUT…
I’ve got a big CRASH when i change the streaming method…
Can you help me to find a way to solve it ?
Make it possible to change the streaming method, modify the blueprint to make it always loaded ? and at least, if nothing is possible, the best way to merge everything in different scenes and render everything.

thanks in advance