I clicked on the “Hide” option and could not find how to display this “AI navigation” GUI again.
Resetting the layout brought it back.
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Thank you! 
Well i’ve done everything that people metioned above but navmesh surface not showing up. It creates navmesh data but only unity’s primitive objects show navmesh surface as blue colored. When i bake my custom models it is not working. Does anyone have an idea ?
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NavMesh not showing up. Gizmo is on, rebake, did everything I could but won’t work jack sh1t. Most scenes work fine but only one scene doesn’t work. Can’t see navmesh. Every geometry is a navmesh static checked. I was able to see before but it suddenly doesn’t work. What the heck is going on here?
This is seriously f**ked up. Duplicating map objects and hiding the original map objects, and then clicking the navigation tab, it shows the baked nav mesh properly. But hide the duplicated objects and show the original one back instantly hides all baked navmesh. What the heck is going on here? Seriously, WTF? Restarting Unity won’t do anything.
I FINALLY FIND IT!
Nothing worked for me, until I reset the editor layout to default - top right, next the “Layers”.
Once I did that, a little black window (Like the gizmos orientation window) titled “AI Navigation” showed up, with some more visualization settings. Some of them were disabled, and enabling them showed everything.
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