The %m|x| was used to specify a left margin for the info; in your example, since "x" is not explicit, it seems the left margin was 0 anyway, so to fix that specific line, theoretically (probably if other previous changes to the wps do not interfere with this line) it would be enough to just remove it and leave it "%al%t10 %pp of %pe;%al%t10 %pvdB", but placing exactly that within a viewport would allow you to precisely specify both vertical and horizontal positions for the info, as explained where karashata and Chronon indicated... in that case you should probably put everything else within a viewport.