The zoom behaviour of Morph is currently being improved. I'm not sure what changes are in stable, but webapps in dev channel certainly have access to zoom settings by the user. There is no option to set it in the command line for webapps, but I recall seeing the suggestion out there. Maybe in time. edit for command line options that are available see: https://docs.ubports.com/en/latest/appdev/webapp/guide.html#command-line-arguments