You probably modified unwittingly (no offence intended) your Footnote Anchor character style,because it behaves as you’d like in my LO copy.
From your screenshot, you forced font to Lato, 11pt, light.
First, restore standard automatic behaviour:
- Go to
Font
tab
- Press button
Standard
, then OK
Check that auto-sizing has been restored.
Button Standard
removes all user-defined attributes and resets the ones shown in the tab to their default state.
Next, proceed with you customisation (Font
tab):
- Select the desired font family (Lato)
- Eventually select the font style (light)
-
Do not click on any size, otherwise you’ll lose the automatic sizing
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