How to stop Player floating at edge of collider

Unfortunately this is the nature of capsulecolliders. You may want to try adding a frictionless physics material to the character's capsulecollider and/or the surface.
 
I added frictionless physics material to both surface and player capsule collider, it's not working. is there any way to fix it?
 
You can add the slide ability. If it is already added you should change the slope so it'll be more sensitive.
 
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