If editing views through Events (check editable views) you are not editing Templates, you modify that one in particular. Therefore, updates (Update button) in each view will save as a "Template edited" automatically. You will also be able to recover that Custom Template when you need it via Select template tool in each Events view.
Note: if you make changes in a template in any Events view and afterwards you select a new template making new customizations in that view, previous Custom template will be replaced by another Custom template if you save.
That Custom template won't be available in Edit template Chronosly > Edit template.