As an editor, you can define the default asset sorting for all users:
Click the paintbrush Themes icon in the left sidebar.
Select Layout and Navigation.
Under the Assets section, choose your preferred default sorting option.
This default sorting will apply to the asset grid view, not collections or individual collection contents.
This is not possible in the backend library. There, if you reload the page the order settings are changed back to “Manual” and you need to change it again to “Newest” for example.