How can i remove default entity?

I need to remove few default entity which i dont need.

see few post here but dont know which file i need to edit to add those code.

delete default entities - EspoCRM Open Source Community Forum

https://forum.espocrm.com/forum/general/76403-delete-default-entities

Hi is it possible to delete some of the default entity type and fields? for an example, i do not need Accounts, knowledge base, opportunities etc.. as entities coz i dont use them

How to change Relationship from "Many-To-Many" to "One-To-Many"? - EspoCRM Open Source Community Forum

https://forum.espocrm.com/forum/general/43629-how-to-change-relationship-from-many-to-many-to-one-to-many#post43690

Hi tanya Right now Contact and Opportunity Relationship is "Many - to - Many" which is default. My use case needs it to be "One - to - Many". Please help

am i need to edit file in this location to remove field.?
/espo/application/Espo/Resources/metadata/fields

to remove entity which file i need to edit?