How to change default Views ?

How to change default Views ?

So we have several custom status's that make all of the default views basically useless.  I need to be able to either
 
a) change the queries of the default views
 
or if that is not possible
 
b) delete the default views
 
So that i can make my own.  Right now i have a list of 15 or so views cluttering the list that no one can use because they are so inflexible. 
 
Thank you in advance for any assistance !

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