The page https://help.libreoffice.org/7.2/en-US/text/shared/guide/keyboard.html?DbPAR=SHARED describes how to control LibreOffice using only the keyboard. I did not find any description that explains how to control form controls by keyboard. Here are some remarks about the missing content: LibreOffice documents (text, spreadsheet, maybe others) may contain control elements such as buttons, checkboxes etc. The author of the document may associate shortcut keys with these controls which are also associated with user interface functions. To resolve the resulting conflicts LibreOffice uses a two state focus system: a) The focus is in the document. If not defined otherwise this is the default state. This state is accessible via the shortcut Ctrl+F6. The shortcut keys go to the LibreOffice user interface. Shortcuts defined for controls in the document are disabled. No control has a decoration indicating that it has the focus. b) The focus is on the controls. In this state the shortcut keys defined for the controls in the document are active. There is one control with a visual marker that indicates that this control has the focus. There are a couple of keys (e.g. cursor keys) that allow to move the focus between different controls. The blank key triggers the execution of the action associated with the control that has the focus. It should be possible reach state b) by pressing Ctrl+F5. This does not work due to a conflict in the user interface: Ctrl+F5 is also defined to toggle the sidebar. Thus the description should take into account how bug 146906 is resolved.