I found it, by watching an online tutorial found in search on youtube.
(thanks Kenny Gioia!)
https://www.youtube.com/watch?v=aFt4I09OGLU
Two steps.
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1. In the effect under param; choose 'show in track controls'
(first touch control wishing to affect, so in ReaComp I touched the 'Wet' fader knob, therefore in paran; list will show 'show last touched').
2. In blank background space in mixer view; right click and select;
'Show FX parameters when size permits.
Voila, done!