How to change the default selection in views filter?
You can change it with custom code in a module or overriding your theme.
You can also use the Better Exposed Filters module. Change the Exposed form options in your Views to use that module option. Then in the further settings you'll be able to override what the options are called for each filter separately.
Drupal 7 also had Views Advanced Labels.

Use this field to rewrite the filter options displayed. Use the format of current_text|replacement_text, one replacement per line. For example:
 Current|Replacement  
 On|Yes
 Off|No

Leave the replacement text blank to remove an option altogether.