Problem with Region command Revit

[enafisifar]

Hello,

I have an issue with Revit 2023 and i can't resolve it. Actually when I create a filled region , Revit dosen't show anymore my plan view as you can see in the photo below. 

I wonder if there is an option that i can use to resolve my problem.

Thank you 

[barthbradley]

Is Detail Items Category turned on?  

[enafisifar]

I've alrealdy controlled it and it's on!

[kostask_oionei]

Check in Tab Manage - Additional Settings - Line Styles the color of <Thin Lines>. Maybe by mistake it is set to white.

[ToanDN]

Turn On Lines category and all subcategories inside it.

[enafisifar]

Lines category and all subcategories is on! becuase I can see all the lines category in plan view when region command is off!! for example you can see my screen shot below and you can see a normal plan view!

[enafisifar]

I've checked them and they're set as normal setting.