Do you want to request a feature or report a bug?
bug
What is the current behavior?
UI is much too small
If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.
What is the expected behavior?
The UI should be bigger so that it is not that small. and better usable from normal distances.
Did this work in previous versions of DocumentServer?
don't know
DocumentServer version:
don't know. Docker install, so probably the newest version
Operating System:
Windows 10
Browser version:
Chromium 79 based browser
Here is a Screenshot:

(just compare the Nextcloud App icons, that have a normal, usable size and the Onlyoffice-UI size in comparison. That shows all problems with that imo. (this is on a 13" inch laptop, and near to unusable state")
Thanks, this is a known issue. We'll try to fix it in future releases, but cannot give any ETA.
Related issue for DesktopEditors https://github.com/ONLYOFFICE/DesktopEditors/issues/53
Most helpful comment
Thanks, this is a known issue. We'll try to fix it in future releases, but cannot give any ETA.
Related issue for DesktopEditors https://github.com/ONLYOFFICE/DesktopEditors/issues/53