diff --git a/index.html b/index.html
index 8abf331..19673f6 100644
--- a/index.html
+++ b/index.html
@@ -135,7 +135,7 @@
   .fbox .ftitle { font-weight:600; font-size:12px; }
   .fbox .fbody { margin-top:8px; }
   .fbox.on { border-color:#2e7d32; background:rgba(46,125,50,.12); }
-  .fbox.toggleable:not(.on) .fbody { opacity:.5; }
+  .fbox.toggleable:not(.on) .fbody { display:none; }   /* hide a feature's parameters until it's enabled */
   .lane-enable { accent-color:#2e7d32; margin:0 2px; cursor:pointer; }
   .lane-row.lane-off { opacity:.5; }
   #themeBtn, #helpBtn { padding:4px 11px; }