The following accessibility features are part of LibreOffice:
Support of external devices and applications
Access to all functions by keyboard. The keys that replace the mouse actions are listed in the LibreOffice Help
Improved readability of screen contents
Zooming of on-screen user interface for menus, icons, and documents
The user interface is scalable through your Window Manageroperating system settings. The default font size for dialogs is 12pt, corresponding to a scale of 100%. You can also change the font size for dialogs in LibreOffice - PreferencesTools - Options - LibreOffice - View. The zoom factor of a document can be changed in View - Zoom, or by double-clicking the zoom factor displayed in the Status Bar.
Please note that accessibility support relies on Java technology for communications with assistive technology tools. This means that the first program startup may take a few seconds longer, because the Java runtime environment has to be started as well.