Article https://help.webex.com/en-us/article/b52wl1/Webex-App-%7C-Update-a-meeting states that meetings scheduled in the app are not editable via the website and vice-versa.
Currently, the desktop App does not show all scheduling options, such as automatic recording and many others.
If all of the scheduling options were available directly in the app, then users will not need to log into the website and/or juggle multiple methods for scheduling meetings.
Most of the advanced options that are not currently present are being added (including automatic recording, selection of meeting type, templates etc) to the app scheduler.
In addition, some options will still not be available like Simultaneous intepretation and Meteings registrations. To address this, we are letting users now edit their meeting on website scheduler.