OnlyOffice- only mobile version


I’m using a Nextcloud which is hosted by my employer.
A few weeks ago I edited documents with OnlyOffice in the browser as Nextcloud-app. I could use the full editor.

Since last week I could only use the mobile version of OnlyOffice on my IPad. On Android, windows and macOs I can use the full editor at least when I request the desktop version of the page.

What can I get the full version back on iOS?