Enable "Hide Whitespace"

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Hi,
How to enable “Hide Whitespace” option in Writer, View menu ?

I checked Tools > Options > LibreOffice > Advanced > “Enable experimental features” but after restart, menu entry is still grayed.

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Answer is here:

Hide Whitespace

The function ‘Hide Whitespace’ is disabled (grey instead of black colour in drop-down) in all documents that I open in LibreOffice’s Writer 5.1.1.3. What do I miss? Many thanks for your help.