Delete an existing Entity (table)

There are 2 methods to delete entity items:
1, Using Views + VBO , select delete action, batch delete all items.
2,Click uninstall /admin/modules/uninstall, you will see some info like this:
"
The following reasons prevent Content Entity Builder from being uninstalled:
There is content for the entity type: Actor3. Remove actor3 entities.
"
Click the remove link, you could remove all entity items of you table.