With the beta feature enabled, I see extra whitespace at the side that doesn't seem to help. (It increases the probability of linewrap, hence I strongly recommend removing it).
If I disable this CSS rule using the inspector, that fixes it.
.mw-rcfilters-ui-changesListWrapperWidget ul {margin-left: calc( ( 6px + 3px ) * 5 + 0.5em );}
Screenshot showing logged-in (with ERI) and logged-out: