Time (Fixed) Field in Writer displays nothing but the words Time (Fixed)

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The Writer 5 user manual gives (p387) some handy shortcuts for fields, including Ctrl+F9 to toggle the time etc on and off. If the Ctrl+F9 shortcut does not work with Mint click on View>Field Names to toggle the view.

Keyboard shortcuts for fields

Here are some handy keyboard shortcuts to use when working with fields:

Ctrl+F2 Open the Fields dialog.

Ctrl+F8 Turn field shadings on or off.

Ctrl+F9 Show or hide field names.

F9 Update fields.