Navmesh problem

hello’
when im trying to put a navmesh, it covers only a small area…
what can i do?

Select the nav area in the prewiev window and press “R” to select rescale ?

With the nav mesh bounds volume selected, click on the details panel.
There will be an option to increase the X, Y & Z bounds.

i increased it to fit the whole floor… but it still look like that :\

The nav mesh is made up of a whole lot of tiles, try to make the tiles smaller by changing the settings in the recast navmesh object under the generation heading or as previously suggested scale everything up so that more tiles fit in the spaces between colliders.