Why are all the shadows still showing preview after building lightning?

After building ligthning at production quality all the shadows are still showing the preview sign.
I restarted the project after it finished because it was lagging very much and after restart it had the preview signs everywhere and it says that there are 5000 unbuild objects.
When I play the game all the shadows are there (but still with the preview sign).
Is there a way to make it disappear?
Is it maybe disappearing after packaging it?
Thx for your help!

Switch the lighting quality to Production and build lighting.

“After building ligthning at production quality…” that’s exactly what I did but it didn’t help