Hi Fromsee, Good Day!
Mobile screens (earlier known as Applets) are stored in a table named sys_sg_screen.
So, if your requirement is to be able to create them from the platform native UI, you can do so by going to the above mentioned table (use sys_sg_screen.list in the filter navigator) and creating new record under that table.
Note that two columns in this table are important in deciding where this screen will appear:
1. Application: This decides under which application (or which navigator tab/ screen launcher) your screen (applet) is going to show up, and 2. Class: This decides whether your screen (applet) is a list screen or a record screen. (Note: You may need to add the two columns to the list layout if they are not already present)
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Additionally, you can leverage the Mobile App Builder which is a UI-based technique to efficiently create new screens and other mobile development components. Please refer to this product document for more: https://docs.servicenow.com/en-US/bundle/sandiego-mobile/page/administer/tablet-mobile-ui/concept/sg...
Hope this helps. Thanks!
