I can't see grid lines in plan

[amirhossein.jafarii]

Hi All, I have grid lines in elevations and section but I can't see them in the plan.

I appreciate if you can help me.

Thank you,

Amir

[ToanDN]

I think you stretched the 3D extent of the grids to above the building based on the picture of your section.  To fix it, go back to the section, select a grid and stretch its 3d extent down to below the lowest Level, or right click on it and maximize 3D extent.  

And remember only stretch 2D extent of grids/levels if you don't want it to affect all other views.

https://cadcamengineering.net/3d-and-2d-datum-extents-revit-architechture/